PISCINE REOVIRUS IMMUNOGENIC COMPOSITIONS

Abstract

The invention is directed to immunogenic compositions and methods for inducing an immune response against Piscine reoviruses in an animal. In another aspect, the invention relates to antibodies that bind Piscine reovirus polypeptides. In yet another aspect, the invention relates to methods for preventing, or reducing PRV infection in an animal.

Description

[0001] This patent disclosure contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the U.S. Patent and Trademark Office patent file or records, but otherwise reserves any and all copyright rights.

[0002] This application claims the benefit of and priority to U.S. provisional patent application Ser. No. 61/248,058 filed Oct. 2, 2009, U.S. provisional patent application Ser. No. 61/325,047 filed Apr. 16, 2010, and U.S. provisional patent application Ser. No. 61/380,594 filed Sep. 7, 2010, the disclosures of all of which are hereby incorporated by reference in their entireties for all purposes.

[0003] All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. The patent and scientific literature referred to herein establishes knowledge that is available to those skilled in the art. The issued patents, applications, and other publications that are cited herein are hereby incorporated by reference to the same extent as if each was specifically and individually indicated to be incorporated by reference. In the case of inconsistencies, the present disclosure will prevail.

BACKGROUND

[0004] Fish are an increasingly important source of food and income; global annual consumption projected to rise from 110 million tons in 2010 to more than 200 million tons in 2030. Whereas rates of wild fish capture are flat or declining due to overfishing and loss of habitat, the global mariculture harvest is growing at a rate in excess of 8% per annum. However, the emergence of infectious diseases in aquaculture threatens production and may also impact wild fish populations. Atlantic salmon (Salmo salar L.) are amongst the most popular of farmed fish, accounting for annual production of more than 1 million tons. Atlantic salmon mariculture has been associated with epidemics of infectious diseases that threaten not only local production, but also wild fish coming into close proximity to marine pens, or fish escaping from them. Heart and skeletal muscle inflammation (HSMI) is a frequently fatal disease of farmed Atlantic salmon. First recognized in one farm in Norway in 1999 (Kongtorp et al., J Fish Dis 27, 351-358 (2004)), HSMI was subsequently implicated in outbreaks in other farms in Norway and the United Kingdom (Ferguson et al., J Fish Dis 28, 119-123 (2005)). Although pathology and disease transmission studies indicated an infectious basis, efforts to identify an agent were unsuccessful.

[0005] HSMI is transmissible but the causal agent has not been previously isolated. HSMI is an important disease that threatens aquaculture. There is a need for immunogenic compositions and vaccines suitable for preventing and containing PRV infection and for treating animals having HSMI. This invention addresses these needs.

SUMMARY OF THE INVENTION

[0006] The invention relates to Piscine reovirus (PRV), a novel orthoreovirus-like virus associated with Salmon HSMI, and isolated nucleic acids sequences and peptides thereof. The invention is also related to antibodies against antigens derived from PRV and method for generating such antibodies. The invention is also related to immunogenic compositions for inducing an immune response against PRV in an animal.

[0007] In one aspect, the invention provides a PRV immunogenic composition comprising a PRV nucleic acid. In one embodiment, the PRV nucleic acid is a nucleic acid sequence of any of SEQ ID NOs: 1-10. In another embodiment, the PRV nucleic acid comprises least 24 consecutive nucleic acids of any of SEQ ID NOs: 1-10. In still another embodiment, the PRV nucleic acid is substantially identical to the nucleic acid sequence of any of SEQ ID NOs: 1-10. In still a further embodiment, the PRV nucleic acid is a variant of any of SEQ ID NOs: 1-10 having at least about 85% identity to SEQ ID NOs: 1-10. In one embodiment, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10.

[0008] In yet another aspect, the invention provides a PRV immunogenic composition comprising a PRV polypeptide. In one embodiment, the PRV polypeptide is a polypeptide encoded by any of SEQ ID NOs: 1-10. In yet another embodiment, the PRV polypeptide is a polypeptide encoded by a nucleic acid comprising least 24 consecutive nucleic acids of any of SEQ ID NOs: 1-10. In still a further embodiment, the PRV polypeptide is a polypeptide encoded by a nucleic acid that is substantially identical to the nucleic acid sequence of any of SEQ ID NOs: 1-10. In still a further embodiment, the PRV polypeptide is a polypeptide encoded by a nucleic acid that is a variant of any of SEQ ID NOs: 1-10 having at least about 85% identity to SEQ ID NOs: 1-10. In still a further embodiment, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10. In yet another embodiment, the PRV polypeptide is a polypeptide comprising the amino acid sequence of SEQ ID NOs: 29-40. In yet another embodiment, the PRV polypeptide is a polypeptide comprising least 8 consecutive amino acids of any of SEQ ID NOs: 29-40. In still a further embodiment, the PRV polypeptide is substantially identical to the amino acid sequence of any of SEQ ID NOs: 29-40. In still another embodiment, the PRV polypeptide is a variant of any of SEQ ID NOs: 29-40 and having at least about 85% identity to SEQ ID NOs: 29-40. In still a further embodiment, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 29-40.

[0009] In another aspect, the invention provides an antibody that binds a PRV or a PRV polypeptide and inhibits, neutralizes or reduces the function or activity of the PRV or PRV polypeptide. In one embodiment, the antibody is a polyclonal antibody. In another embodiment, the antibody is a monoclonal antibody. In still a further embodiment, the antibody is a teleost antibody. In yet another embodiment, the antibody is a salmon antibody. In still another embodiment, the antibody is an IgM antibody. In yet another embodiment, the antibody is a chimeric antibody.

[0010] In another aspect, the invention provides an immunogenic composition comprising a killed virus comprising a PRV polypeptide. In still another aspect, the invention provides an immunogenic composition comprising an attenuated virus comprising a PRV polypeptide. In one embodiment, any of the immunogenic compositions described herein further comprise at least one excipient, additive or adjuvant. In one embodiment, any of the immunogenic compositions described herein further comprise at least one polypeptide, or fragment thereof, from an additional virus.

[0011] In another aspect, the invention provides an immunogenic composition comprising a fusion polypeptide, wherein the fusion polypeptide comprises a PRV polypeptide, a fragment, of a variant thereof and at least one polypeptide, or fragment thereof, from an additional virus. In one embodiment, the additional virus is selected from the group consisting of Sleeping disease virus (SDV); salmon pancreas disease virus (SPDV); infectious salmon anemia (ISAV); Viral hemorrhagic septicemia virus (VHSV); infectious hematopoietic necrosis virus (IHNV); infectious pancreatic necrosis virus (IPNV); spring viremia of carp (SVC); channel catfish virus (CCV); Aeromonas salmonicida; Renibacterium salmoninarum; Moritella viscosis, Yersiniosis; Pasteurellosis; Vibro anguillarum; Vibrio logei; Vibrio ordalii; Vibrio salmonicida; Edwardsiella ictaluri; Edwardsiella tarda; Cytophaga columnari; or Piscirickettsia salmonis.

[0012] In another aspect, the invention provides a method of inducing an immune response in an animal, the method comprising administering any PRV immunogenic composition described herein.

[0013] In another aspect, the invention provides a method for preventing, or reducing PRV infection in an animal, the method comprising administering any PRV immunogenic composition described herein.

[0014] In another aspect, the invention provides a method for preventing, or reducing PRV infection in an animal, the method comprising administering to the animal any antibody described herein.

[0015] In one embodiment, the method of any administration in the methods described herein is oral administration, immersion administration or injection administration.

[0016] In yet another aspect, the invention provides for use of any of the immunogenic compositions described herein in the manufacture of a vaccine for the treatment of condition PRV infection in an animal.

[0017] In yet another aspect, the invention provides for use of any of the immunogenic compositions described herein in the manufacture of a vaccine for preventing or reducing a condition PRV infection in an animal.

BRIEF DESCRIPTION OF THE FIGURES

[0018] FIG. 1. Piscine reovirus (PRV) sequence obtained by pyrosequencing. Assembled sequence data mapped against the concatenated sequences of PRV. Genomic regions identified by BLASTN, BLASTX, FASTX, and FASD are shown in red, blue, green, and orange respectively.

[0019] FIG. 2. Phylogenetic analysis of the RNA-dependent RNA-polymerase of Reoviridae. Full length amino acid sequences were aligned using the ClustalX 14 implemented on MEGA software (Tamura et al., Mol Biol Evol 24, 1596-1599 (2007)) and refined using T-Coffee (Notredame et al., J Mol Biol 302, 205-217 (2000)) to incorporate protein structure data. Phylogenetic analysis was performed using p-distance as model of amino acid substitution as implemented by ICTV for analysis of the Reoviridae family (Mertens et al., T. Family Reoviridae. 447-454 (Elsevier Academic Press, 2005)). MEGA was used to produce phylogenetic trees, reconstructed through the Neighbor Joining (NJ) method. The statistical significance of a particular tree topology was evaluated by bootstrap re-sampling of the sequences 1000 times.

[0020] FIG. 3. Graphical representation of group differences in the log ratio of virus load normalized to a salmon host gene. Nonparametric approaches were used to determine statistical significance for comparisons of the relative viral load among healthy and HSMI-affected farmed fish. Log transformations, which did not normalize log ratio distributions, were nonetheless performed for all samples after calculating L1 (virus)/EF1A (housekeeping) ratios to aid in graphical representation. FIG. 3A shows a comparison of adjusted log ratio in mixed heart and kidney samples from healthy farmed fish and farmed fish with HSMI; *, p<0.0001 (Mann-Whitney U). FIG. 3B shows a comparison of adjusted log ratios in farmed fish without HSMI (healthy farmed fish), in the early phase of an HSMI outbreak, in the middle of an HSMI outbreak, and during the peak of an HSMI outbreak; **, p<0.0005; *, p<0.01 (individual Mann-Whitney U). Adjusted log ratios also differed significantly across all four farmed fish groups (p<0.0001; Kruskal-Wallis).

[0021] FIG. 4. In situ hybridization was performed using locked nucleic acid (LNA) probes targeting the L2 segment of the Piscine reovirus. Sections were permeabilized using proteinase K followed by hybridization with digoxigenin (DIG)-labeled LNA probes. Sections were incubated with a mouse monoclonal anti-DIG-horse radish peroxidase and stained using a Tyramide Signal Amplification System. Sections were counterstained with Meyer's hematoxylin solution. FIG. 4A shows heart from HSMI-infected fish (10.times.). FIG. 4B shows heart from HSMI-infected fish (40.times.). FIG. 4C shows heart from non-infected fish (40.times.). FIG. 4D shows heart from a fish infected with salmon pancreas disease virus.

[0022] FIG. 5. Phylogenetic analysis of the Lambda-1 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0023] FIG. 6. Phylogenetic analysis of the Lambda-2 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0024] FIG. 7. Phylogenetic analysis of the Lambda-3 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0025] FIG. 8. Phylogenetic analysis of the Mu-1 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0026] FIG. 9. Phylogenetic analysis of the Mu-2 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0027] FIG. 10. Phylogenetic analysis of the Mu-3 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0028] FIG. 11. Phylogenetic analysis of the Sigma-2 ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0029] FIG. 12. Phylogenetic analysis of the Sigma-NS ORF of the Aquareovirus and Orthoreovirus. Bayesian phylogenetic analyses of sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS (.sigma.1 and .sigma.3 of aquareovirus and orthoreovirus had different genomic organizations) were conducted using BEAST, BEAUti and Tracer analysis software packages. Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states. Colored boxes indicate representatives of different reovirus genera or species. Green, Aquareovirus genus; blue, species I (mammalian orthoreovirus); red, species II (avian orthoreovirus); purple, species III (Nelson Bay orthoreovirus); orange, species IV (reptilian orthoreovirus) and light blue, species V (Baboon orthoreovirus).

[0030] FIG. 13. Putative ORF of S1 has characteristics similar to FAST proteins. Hydrophobicity plots of ARV (red) and PRV (blue) obtained using the Kyle-Doolittle algorithm implemented in the program TopPred (available at http://mobyle.pasteurfr/cgibin/portal.py?form=toppred). Sequence analysis show that PRV contains the primary components of a FAST protein: hydrophobic region (HP), transmembrane domain (TM) and basic region (BR).

[0031] FIG. 14. The pathology of PRV infection can include liver discoloration, heamopericardium, congestion in fatty tissue and swollen spleen.

[0032] FIG. 15. Coverage by pyrosequencing.

[0033] FIG. 16. Phylogenetic analysis of PRV, Orthoreovirus and Aquareovirus.

[0034] FIG. 17. Diagnosis of HSMI showing infiltration of the epicardium as well as severe inflammation of the myocardium.

[0035] FIG. 18. A schematic illustration for a method for generating antibodies against .sigma.1, .sigma.3 and .mu.1C. FIG. 18A shows outer capsid proteins .sigma.1, .sigma.3, .lamda.2, .mu.1c and inner capsid proteins .lamda.1, .sigma.2, .mu.2, and .lamda.3. FIG. 18B shows amplification of .sigma.1, .sigma.3 and .mu.1C full length segments by PCR. FIG. 18C shows that the amplified segments can be cloned into an expression vector to make an expression construct. The expression can be used to express antigens in an expression system (e.g. E. coli). The antigens can then be purified and used to immunize rabbits.

[0036] FIG. 19. Peptide antigen. FIG. 19A shows FAST (fusion-associated small transmembrane protein encoded by S4. FIG. 19B shows the variation of the antigenic index as a function of amino acid position. The higher the antigenic index, the more likely should be that antibodies would "see" those groups of residues.

[0037] FIG. 20. The antiserum recognizes the .mu.1C protein as found in Western blots of E. coli His-tag fusion protein. Lines 11-13, eluates of purified protein; L14-15, dilutions of pellet of induced bacteria, L16-L17 pellet of non-induced bacteria

[0038] FIG. 21. The antiserum recognizes the .sigma.2 protein as found in western blots of E. coli His-tag fusion protein and different negative controls. Lines 2-4, eluates of purified protein; L5-6, dilutions of pellet of induced bacteria, L7-L8 pellet of non-induced bacteria.

[0039] FIG. 22. PRV Illustration.

DETAILED DESCRIPTION

[0040] The singular forms "a," "an," and "the" include plural reference unless the context clearly dictates otherwise.

[0041] The term "about" is used herein to mean approximately, in the region of roughly, or around. When the term "about" is used in conjunction with a numerical range, it modifies that range by extending the boundaries above and below the numerical values set forth. In general, the term "about" is used herein to modify a numerical value above and below the stated value by a variance of 20%.

[0042] As used herein, "PRY" refers to isolates of the Piscine reoviruses described herein.

[0043] As used herein, the term "animal" refers to a vertebrate, including, but not limited to a teleost (e.g. salmon).

[0044] As used herein, the term "PRV" polypeptide includes a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide.

[0045] As used herein, the term "antibody" refers to an antibody that binds to a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide and inhibit, neutralize or reduce the activity or function of a PRV polypeptide or a PRV. The term antibody specifically excludes diagnostic antibodies which bind a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide and which do not inhibit, neutralize or reduce the activity or function of the polypeptide or the PRV.

[0046] Mariculture, aquaculture in marine environments, is an increasingly important source of dietary protein for human consumption. HSMI appears 5 to 9 months after fish are transferred from fresh water to ocean pens (Kongtorp et al., J Fish Dis 27, 351-358 (2004)), but outbreaks have been recorded as early as 14 days following seawater transfer. Affected fish are anorexic and display abnormal swimming behavior. Autopsy findings typically include a pale heart, yellow liver, ascites, swollen spleen and petechiae in the perivisceral fat. The pathology is further characterized by epi-, endo- and myocarditis, myocardial necrosis, myositis and necrosis of red skeletal muscle, and up to 20% mortality (Kongtorp et al., Dis Aquat Organ 59, 217-224 (2004)). While mortality is variable (up to 20%), morbidity may be very high in affected cages. HSMI is diagnosed on the basis of histopathology. The major pathological changes occur in the myocardium and red skeletal muscle, where extensive inflammation and multifocal necrosis of myocytes are evident.

[0047] Disease can be induced in naive fish by experimental injection with tissue homogenate from HSMI diseased fish or by cohabitation with fish with HSMI (Kongtorp et al., J Fish Dis 27, 351-358 (2004)). Virus-like particles have been observed (Watanabe, K. et al., Dis Aquat Organ 70, 183-192 (2006)); however, efforts to implicate an infectious agent by using culture, subtractive cloning and consensus polymerase chain reaction have been unsuccessful.

[0048] In one aspect, the present invention shows that HSMI is associated with infection with a novel reovirus termed Piscine reovirus (PRV). PRV was identified through high-throughput pyrosequencing of scrum and heart tissue of experimentally infected fish using novel frequency analysis methods as well as standard alignment methods. In another aspect, the present invention provides PRV nucleic acid sequences.

[0049] In other aspects, the invention is directed to expression constructs, for example plasmids and vectors, and isolated nucleic acids which comprise PRV nucleic acid sequences of SEQ ID NOs: 1-10, fragments, complementary sequences, and/or variants thereof.

[0050] The nucleic acid sequences and polypeptides described herein may be useful for multiple applications, including, but not limited to, generation of antibodies and generation of immunogenic compositions. For example, in one aspect, the invention is directed to an immunogenic composition comprising a polypeptide encoded by a PRV nucleic sequence acid of any one of SEQ ID NOs: 1-10.

[0051] In another aspect, the invention is directed to an immunogenic composition comprising a polypeptide comprising the amino acid sequence of any one of SEQ ID NOs: 29-40.

[0052] In one aspect, the invention provides an isolated PRV nucleic acid having the sequence of any of SEQ ID NOs: 1-10, or a fragment thereof.

[0053] In another aspect, the invention provides an isolated PRV nucleic acid which comprises consecutive nucleotides having a sequence selected from the group consisting of any of SEQ ID NOs: 1-10, or a fragment thereof.

[0054] In another aspect, the invention provides an isolated PRV nucleic acid which comprises consecutive nucleotides having a sequence selected from a variant of any of SEQ ID NOs: 1-10 or a fragment thereof. In one embodiment, the variant has at least about 85% identity to SEQ ID NOs: 1-10, or a fragment thereof. In one embodiment of the above aspect of the invention, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10, or a fragment thereof.

[0055] In one aspect, the invention provides an isolated PRV nucleic acid complementary to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0056] In another aspect, the invention provides an isolated PRV nucleic acid which comprises consecutive nucleotides complementary to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0057] In another aspect, the invention provides an isolated PRV nucleic acid which comprises consecutive nucleotides complementary to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof. In one embodiment, the variant has at least about 85% identity to SEQ ID NOs: 1-10, or a fragment thereof. In one embodiment of the above aspect of the invention, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10, or a fragment thereof.

[0058] In another aspect, the invention provides an isolated PRV nucleic acid having a sequence substantially identical to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0059] In another aspect, the invention provides an isolated PRV nucleic acid having a sequence substantially identical to a sequence complementary to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0060] The PRV nucleic acid sequences described herein may be useful for, inter alia, expression of PRV-encoded proteins or fragments, variants, or derivatives thereof, generation of antibodies against PRV proteins, generating vaccines against Piscine reoviruses, and screening for drugs effective against Piscine reoviruses as described herein.

[0061] In one aspect, the invention provides an isolated PRV polypeptide encoded by a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0062] In one embodiment, the PRV polypeptide fragment can be a polypeptide comprising about 8 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 10 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 14 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 16 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 18 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 20 consecutive amino acids of a PRV polypeptide described herein. In another embodiment, the fragment can be a polypeptide comprising about 21 or more consecutive amino acids of a PRV polypeptide described herein.

[0063] In yet another embodiment, the PRV polypeptide fragment can be a polypeptide comprising from about 8 to about 50, about 8 to about 100, about 8 to about 200, about 8 to about 300, about 8 to about 400, about 8 to about 500, about 8 to about 600, about 8 to about 700, about 8 to about 800, about 8 to about 900 or more consecutive amino acids from a PRV polypeptide.

[0064] In another aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid which comprises consecutive nucleotides having a sequence selected from a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0065] In another aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid which comprises consecutive nucleotides having a sequence selected from a variant of a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10 or a fragment thereof. In one embodiment, the variant has at least about 85% identity to SEQ ID NOs: 1-10, or a fragment thereof. In one embodiment of the above aspect of the invention, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10, or a fragment thereof.

[0066] In one aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid complementary a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0067] In another aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid which comprises consecutive nucleotides a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0068] In another aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid having a sequence substantially identical to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0069] In another aspect, the invention provides an isolated PRV polypeptide encoded by a nucleic acid having a sequence substantially identical to a sequence complementary to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0070] In one aspect, the invention provides an isolated PRV polypeptide having the sequence of any of SEQ ID NOs: 29-40, or a fragment thereof.

[0071] In another aspect, the invention provides an isolated PRV polypeptide which comprises consecutive amino acids having a sequence selected from the group consisting of any of SEQ ID NOs: 29-40, or a fragment thereof.

[0072] In another aspect, the invention provides an isolated PRV polypeptide which comprises consecutive amino acids having a sequence selected from a variant of any of SEQ ID NOs: 29-40, or a fragment thereof. In one embodiment, the variant has at least about 85% identity to SEQ ID NOs: 29-40, or a fragment thereof. In one embodiment of the above aspect of the invention, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 1-10, or a fragment thereof.

[0073] In another aspect, the invention provides an isolated PRV polypeptide having a sequence substantially identical to a PRV amino acid sequence in any of SEQ ID NOs: 29-40, or a fragment thereof.

[0074] The PRV polypeptides and amino acid sequences described herein may be useful for, inter alia, expression of PRV-encoded proteins or fragments, variants, or derivatives thereof, and generating vaccines against Piscine reoviruses.

[0075] In one aspect, the invention provides an isolated PRV polypeptide encoded by a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, or a fragment thereof.

[0076] In one embodiment, the isolated PRV polypeptide fragment can be a polypeptide comprising about 8 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 10 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 14 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 16 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 18 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 20 consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40. In another embodiment, the fragment can be a polypeptide comprising about 21 or more consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40.

[0077] In yet another embodiment, the isolated PRV polypeptide fragment can be a polypeptide comprising from about 8 to about 50, about 8 to about 100, about 8 to about 200, about 8 to about 300, about 8 to about 400, about 8 to about 500, about 8 to about 600, about 8 to about 700, about 8 to about 800, about 8 to about 900 or more consecutive amino acids of a PRV amino acid sequence of any of SEQ ID NOs: 29-40.

[0078] In another aspect, the invention provides an isolated PRV polypeptide which comprises consecutive amino acids having a sequence selected from a PRV amino acid sequence of any of SEQ ID NOs: 29-40.

[0079] In another aspect, the invention provides an isolated PRV polypeptide which comprises consecutive nucleotides having a sequence selected from a variant a PRV amino acid sequence of any of SEQ ID NOs: 29-40, or a fragment thereof. In one embodiment, the variant has at least about 85% identity to any of SEQ ID NOs: 29-40, or a fragment thereof. In one embodiment of the above aspect of the invention, the variant has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to any of SEQ ID NOs: 29-40, or a fragment thereof.

[0080] In another aspect, the invention provides an isolated PRV polypeptide substantially identical to variant a PRV amino acid sequence of any of SEQ ID NOs: 29-40, or a fragment thereof.

[0081] "Substantially identical," in the context of two nucleic acids or polypeptides, refers to two or more sequences or subsequences that have at least of at least 98%, at least 99% or higher nucleotide or amino acid residue identity, when compared and aligned for maximum correspondence, as measured using one of the following sequence comparison algorithms or by visual inspection. Thus, in certain embodiments, polypeptides that a substantially identical to the PRV polypeptides described herein can also be used to generate antibodies that bind to the PRV polypeptides described herein.

[0082] "Percent identity" in the context of two or more nucleic acids or polypeptide sequences, refers to the percentage of nucleotides or amino acids that two or more sequences or subsequences contain which are the same. A specified percentage of amino acid residues or nucleotides can have a specified identity over a specified region, when compared and aligned for maximum correspondence over a comparison window, or designated region as measured using one of the following sequence comparison algorithms or by manual alignment and visual inspection. In one aspect, the invention provides a PRV polypeptide which is a variant of a PRV polypeptide and has at least about 90%, about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to a PRV polypeptide shown in SEQ ID NOs 29-40.

[0083] It will be understood that, for the particular PRV polypeptides described here, natural variations can exist between individual PRV strains. These variations may be demonstrated by (an) amino acid difference(s) in the overall sequence or by deletions, substitutions, insertions, inversions or additions of (an) amino acid(s) in said sequence. Amino acid substitutions which do not essentially alter biological and immunological activities, have been described, e.g. by Neurath et al in "The Proteins" Academic Press New York (1979). Amino acid replacements between related amino 15 acids or replacements which have occurred frequently in evolution are, inter alia, Ser/Ala, Ser/Gly, Asp/Gly, Asp/Asn, Ile/Val (sec Dayhof, M. D., Atlas of protein sequence and structure, Nat. Biomed. Res. Found., Washington D.C., 1978, vol. 5, suppl. 3). Other amino acid substitutions 20 include Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Thr/Phe, Ala/Pro, Lys/Arg, Leu/Ile, Leu/Val and Ala/Glu. Based on this information, Lipman and Pearson developed a method for rapid and sensitive protein comparison (Science, 227, 1435-1441, 1985) and determining the functional similarity between homologous proteins. Such amino acid substitutions of the exemplary embodiments of this invention, as well as variations having deletions and/or insertions are within the scope of the invention as long as the resulting proteins retain their immune reactivity. It is know that polypeptide sequences having one or more amino acid sequence variations as compared to a reference polypeptide may still be useful for generating antibodies that bind the reference polypeptide. Thus in certain embodiments, the PRV polypeptides and the antibodies and antibody generation methods related thereto encompass PRV polypeptides isolated from different virus isolates that have sequence identity levels of at least about 90%, while still representing the same PRV protein with the same immunological characteristics.

[0084] The sequence identities can be determined by analysis with a sequence comparison algorithm or by a visual inspection. Protein and/or nucleic acid sequence identities (homologies) can be evaluated using any of the variety of sequence comparison algorithms and programs known in the art.

[0085] For sequence comparison, typically one sequence acts as a reference sequence, to which test sequences are compared. When using a sequence comparison algorithm, test and reference sequences are entered into a computer, subsequence coordinates are designated, if necessary, and sequence algorithm program parameters are designated. Default program parameters can be used, or alternative parameters can be designated. The sequence comparison algorithm then calculates the percent sequence identities for the test sequences relative to the reference sequence, based on the program parameters. For sequence comparison of nucleic acids and proteins, the BLAST and BLAST 2.2.2. or FASTA version 3.0t78 algorithms and the default parameters discussed below can be used.

[0086] An example of an algorithm that is suitable for determining percent sequence identity and sequence similarity is the FASTA algorithm, which is described in Pearson, W. R. & Lipman, D. J., Proc. Natl. Acad. Sci. U.S.A. 85: 2444, 1988. Sec also W. R. Pearson, Methods Enzymol. 266: 227-258, 1996. Exemplary parameters used in a FASTA alignment of DNA sequences to calculate percent identity are optimized, BL50 Matrix 15: -5, k-tuple=2; joining penalty=40, optimization=28; gap penalty -12, gap length penalty=-2; and width=16.

[0087] Another example of algorithm that is suitable for determining percent sequence identity and sequence similarity are the BLAST and BLAST 2.0 algorithms, which are described in Altschul et al., Nuc. Acids Res. 25:3389-3402, 1977; and Altschul et al., J. Mol. Biol. 215:403-410, 1990, respectively. BLAST and BLAST 2.0 are used, with the parameters described herein, to determine percent sequence identity for the nucleic acids and proteins of the invention. Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information (http://www.ncbi.nlm.nih.gov/). The BLAST algorithm parameters W, T, and X determine the sensitivity and speed of the alignment. The BLASTN program (for nucleotide sequences) uses as defaults a wordlength (W) of 11, an expectation (E) of 10, M=5, N=-4 and a comparison of both strands. For amino acid sequences, the BLASTP program uses as defaults a wordlength of 3, and expectation (E) of 10, and the BLOSUM62 scoring matrix (see Henikoff & Henikoff, Proc. Natl. Acad. Sci. U.S.A. 89:10915, 1989) alignments (B) of 50, expectation (E) of 10, M=5, N=-4, and a comparison of both strands.

[0088] The BLAST algorithm also performs a statistical analysis of the similarity between two sequences (see, e.g., Karlin & Altschul, Proc. Natl. Acad. Sci. U.S.A. 90:5873-5787, 1993). One measure of similarity provided by the BLAST algorithm is the smallest sum probability (P(N)), which provides an indication of the probability by which a match between two nucleotide or amino acid sequences would occur by chance. For example, a nucleic acid is considered similar to a reference sequence if the smallest sum probability in a comparison of the test nucleic acid to the reference nucleic acid is less than about 0.2, less than about 0.01, and less than about 0.001.

[0089] Another example of a useful algorithm is PILEUP. PILEUP creates a multiple sequence alignment from a group of related sequences using progressive, pairwise alignments to show relationship and percent sequence identity. It also plots a tree or dendogram showing the clustering relationships used to create the alignment. PILEUP uses a simplification of the progressive alignment method of Feng & Doolittle, J. Mol. Evol. 35:351-360, 1987. The method used is similar to the method described by Higgins & Sharp, CABIOS 5:151-153, 1989. The program can align up to 300 sequences, each of a maximum length of 5,000 nucleotides or amino acids. The multiple alignment procedure begins with the pairwise alignment of the two most similar sequences, producing a cluster of two aligned sequences. This cluster is then aligned to the next most related sequence or cluster of aligned sequences. Two clusters of sequences are aligned by a simple extension of the pairwise alignment of two individual sequences. The final alignment is achieved by a series of progressive, pairwise alignments. The program is run by designating specific sequences and their amino acid or nucleotide coordinates for regions of sequence comparison and by designating the program parameters. Using PILEUP, a reference sequence is compared to other test sequences to determine the percent sequence identity relationship using the following parameters: default gap weight (3.00), default gap length weight (0.10), and weighted end gaps. PILEUP can be obtained from the GCG sequence analysis software package, e.g., version 7.0 (Devereaux et al., Nuc. Acids Res. 12:387-395, 1984.

[0090] Another example of an algorithm that is suitable for multiple DNA and amino acid sequence alignments is the CLUSTALW program (Thompson, J. D. et al., Nucl. Acids. Res. 22:4673-4680, 1994). ClustalW performs multiple pairwise comparisons between groups of sequences and assembles them into a multiple alignment based on homology. Gap open and Gap extension penalties were 10 and 0.05 respectively. For amino acid alignments, the BLOSUM algorithm can be used as a protein weight matrix (Henikoff and Henikoff, Proc. Natl. Acad. Sci. U.S.A. 89:10915-10919, 1992).

[0091] In yet a further aspect, the invention provides a computer readable medium having stored thereon (i) a nucleic acid sequence selected from the group consisting of: a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, a sequence substantially identical to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10; a sequence variant of a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10; or (ii) an amino acid sequence encoded by a nucleic acid sequence selected from the group consisting of: a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10, an amino acid sequence encoded by a sequence substantially identical to a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10; an amino acid sequence encoded by a sequence variant of a PRV nucleic acid sequence in any of SEQ ID NOs: 1-10.

[0092] The polypeptides described herein can be used for raising antibodies (e.g. for vaccination purposes). In one aspect, the invention provides antibody that binds a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide and wherein the antibody is a vaccine antibody that inhibits, neutralizes or reduces the activity or function of the polypeptide or a PRV. In some embodiments, the antibody is a polyclonal antibody, a monoclonal antibody, a teleost antibody or a chimeric antibody. Methods for purifying immunoglobulins from teleosts are also known in the art. See, for example, Havarstein et al, Dev Comp Immunol 1988, 12(4):773-85; Al-Harbi et al, Bull Eur Ass Fish Pathol 1993, 13:40-4; Itami et al, Nippon Suisan Gakkaishi 1988, 54(9):1611-7.

[0093] In still a further aspect, the invention provides a PRV immunogenic composition comprising a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide.

[0094] As used herein, the term "immunogenic polypeptide" refers to a PRV polypeptide, or a fragment of a PRV polypeptide capable of inducing an immune response in a vertebrate host (e.g. a teleost). The term "immunogenic polypeptide" also refers to a PRV polypeptide, or a fragment of a PRV polypeptide that can be used to generate an antibody against the PRV polypeptide, or a fragment of a PRV polypeptide using other antibody generation techniques known in the art, including, but not limited to, hybridoma, phage display and ribosome display technologies.

[0095] In still a further aspect, the invention provides a PRV vaccine composition comprising a PRV nucleic acid, a PRV nucleic acid fragment or a PRV nucleic acid variant, a nucleic acid substantially identical to a PRV nucleic acid, a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide.

[0096] One of skill in the art will recognize that when polypeptides are used for raising antibodies, it is not necessary to use the entire polypeptide to generate an antibody capable of recognizing the full length polypeptide. In certain aspects, the invention is directed to methods for generating antibodies that bind to the PRV polypeptides described herein by generating antibodies that bind to a fragment of a polypeptide described herein. Thus, in one aspect, the invention relates to vaccines for combating PRV infection, that comprise a protein or immunogenic fragments of a PRV polypeptide. Still another embodiment of the present invention relates to the PRV proteins described herein or immunogenic fragments thereof for use in a vaccine. In still another embodiment, the invention relates to the use of the PRV proteins described herein or immunogenic fragments thereof for the manufacturing of a vaccine for combating PRV infections.

[0097] In one embodiment, the PRV immunogenic compositions and PRV vaccines described herein are capable of ameliorating the symptoms of a PRV infection and/or of reducing the duration of a PRV infection. In another embodiment, the immunogenic compositions are capable of inducing protective immunity against PRV infection. The immunogenic compositions of the invention can be effective against the PRV disclosed herein, and may also be cross-reactive with, and effective against, multiple different clades and strains of PRV, and against other reoviruses.

[0098] In other aspect, the invention provides a nucleic acid vectors comprising a PRV nucleic acid sequence, a PRV nucleic acid fragment or a PRV nucleic acid variant, or a nucleic acid substantially identical to a PRV nucleic acid.

[0099] In another aspect, the invention provides a nucleic acid vector encoding a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide. Non-limiting examples of vectors include, but are not limited to retroviral, adenoviral, adeno-associated viral, lentiviral, and vesiculostomatitis viral vectors.

[0100] In yet another aspect, the invention provides a host organism comprising a nucleic acid vector encoding a PRV polypeptide, a PRV polypeptide fragment or a PRV polypeptide variant, or a polypeptide substantially identical to a PRV polypeptide. In one embodiment, the host organism is a prokaryote, a eukaryote, or a fungus. In another embodiment the organism is a teleost (e.g. a salmon).

[0101] In another aspect, the invention provides a method of inducing an immune response in an animal (e.g. a salmon), the method comprising administering a PRV nucleic acid, a PRV polypeptide or a PRV immunogenic composition to the animal. Methods for administering polypeptides to animals (e.g. teleosts), and methods for generating immune responses in animals (e.g. teleosts) by administering immunogenic peptides in immunogenically effective amounts are known in the art.

[0102] Teleost lack bone marrow or lymph and B-cell lymphogenesis occurs in the head kidney (pronephros) and spleen. For a review of preimmune diversification and antibody generation in teleosts, see Solem and Stenvik, Developmental and Comparative Immunology 30 (2006) 57-76). Unlike mammals, where several classes of immunoglobulins (e.g. IgG, IgE and IgA, among others) are present in the circulation, structurally heterogeneous IgM tetramers are the most prevalent immunoglobulin in teleosts (Warr G. W. (1995): Developmental and Comparative Immunology, 19, 1-12; Koumansvandiepen et al, (1995) Developmental and Comparative Immunology, 19, 97-108; Kaattari et al, 1998. Immunol. Rev. 166:133-142; Evans et al, 1998. J. Theor. Biol. 195:505-524). IgD, IgZ, IgT and IgH immunoglobulins have also been identified in teleosts (Hordvik et al, (1999) Scandinavian Journal of Immunology, 50, 202-2101; Hirono et al, (2003) Fish & Shellfish Immunology, 15, 63-70; Danilova et al, (2000) Immunogenetics, 52, 81-91; Hansen et al, (1994) Molecular Immunology, 31, 499-501; Savan et al, (2005) European Journal of Immunology, 35, 3320-3331).

[0103] The polypeptides described herein can be used in the form of a PRV immunogenic composition to vaccinate an animal (e.g. a teleost) according to any method known in the art. See, for example, Veseley et al, Veterinarni Medicina, 51, 2006 (5): 296-302; Engelbrecht et al, Acta Vet Scand 1997, 38(3):275-82; Ingram et al, J Fish Biol 1979, 14(3):249-60. An immunogenic composition for use in vaccination can also include attenuated live viral vaccines, inactivated (killed) viral vaccines, and subunit vaccines. In certain embodiments, PRVs may be attenuated by removal or disruption of viral sequences whose products cause or contribute to the disease and symptoms associated with PRV infection, and leaving intact those sequences required for viral replication. In this way an attenuated PRV can be produced that replicates in animals, and induces an immune response in animals, but which does not induce the deleterious disease and symptoms usually associated with PRV infection. One of skill in the art can determine which PRV sequences can or should be removed or disrupted, and which sequences should be left intact, in order to generate an attenuated PRV suitable for use as a vaccine. PRV vaccines may also comprise inactivated PRV, such as by chemical treatment, to "kill" the viruses such that they are no longer capable of replicating or causing disease in animals, but still induce an immune response in an animal (e.g. a salmon). There are many suitable viral inactivation methods known in the art and one of skill in the art can readily select a suitable method and produce an inactivated "killed" PRV suitable for use as a vaccine.

[0104] Methods of purification of polypeptides and of inactivated virus are known in the art and may include one or more of, for instance gradient centrifugation, ultracentrifugation, continuous-flow ultracentrifugation and chromatography, such as ion exchange chromatography, size exclusion chromatography, and liquid affinity chromatography. Additional method of purification include ultrafiltration and dialfiltration. See J P Gregersen "Herstellung von Virussimpfstoffen aus Zellkulturen" Chapter 4.2 in Pharmazeutische Biotechnology (eds. O. Kayser and R H Mueller) Wissenschaftliche Verlagsgesellschaft, Stuttgart, 2000. See also, O'Neil et al., "Virus Harvesting and Affinity Based Liquid Chromatography. A Method for Virus Concentration and Purification", Biotechnology (1993) 11:173-177; Prior et al., "Process Development for Manufacture of Inactivated HIV-1", Pharmaceutical Technology (1995) 30-52; and Majhdi et al., "Isolation and Characterization of a Coronavirus from Elk Calves with diarrhea" Journal of Clinical Microbiology (1995) 35(11): 2937-2942.

[0105] Other examples of purification methods suitable for use in the invention include polyethylene glycol or ammonium sulfate precipitation (see Trepanier et al., "Concentration of human respiratory syncytial virus using ammonium sulfate, polyethylene glycol or hollow fiber ultrafiltration" Journal of Virological Methods (1981) 3(4):201-211; Hagen et al., "Optimization of Poly(ethylene glycol) Precipitation of Hepatitis Virus Used to prepare VAQTA, a Highly Purified Inactivated Vaccine" Biotechnology Progress (1996) 12:406-412; and Carlsson et al., "Purification of Infectious Pancreatic Necrosis Virus by Anion Exchange Chromatography Increases the Specific Infectivity" Journal of Virological Methods (1994) 47:27-36) as well as ultrafiltration and microfiltration (see Pay et al., Developments in Biological Standardization (1985) 60:171-174; Tsurumi et al., "Structure and filtration performances of improved cuprammonium regenerated cellulose hollow fiber (improved BMM hollow fiber) for virus removal" Polymer Journal (1990) 22(12):1085-1100; and Makino et al., "Concentration of live retrovirus with a regenerated cellulose hollow fiber, BMM", Archives of Virology (1994) 139(1-2):87-96).

[0106] Polypeptides and viruses can be purified using chromatography, such as ion exchange, chromatography. Chromatic purification allows for the production of large volumes of virus containing suspension. The viral product of interest can interact with the chromatic medium by a simple adsorption/desorption mechanism, and large volumes of sample can be processed in a single load. Contaminants which do not have affinity for the adsorbent pass through the column. The virus material can then be eluted in concentrated form.

[0107] Anion exchange resins that may be used include DEAE, EMD TMAE. Cation exchange resins may comprise a sulfonic acid-modified surface. Viruses can be purified using ion exchange chromatography comprising a strong anion exchange resin (e.g. EMD TMAE) for the first step and EMD-SO.sub.3 (cation exchange resin) for the second step. A metal-binding affinity chromatography step can optionally be included for further purification. (See, e.g., WO 97/06243).

[0108] A resin such as Fractogel EMD can also be used This synthetic methacrylate based resin has long, linear polymer chains covalently attached and allows for a large amount of sterically accessible ligands for the binding of biomolecules without any steric hindrance.

[0109] Column-based liquid affinity chromatography is another purification method that can be used invention. One example of a resin for use in purification method is Matrex Cellufine Sulfate (MCS). MCS consists of a rigid spherical (approx. 45-105 diameter) cellulose matrix of 3,000 Dalton exclusion limit (its pore structure excludes macromolecules), with a low concentration of sulfate ester functionality on the 6-position of cellulose. As the functional ligand (sulfate ester) is relatively highly dispersed, it presents insufficient cationic charge density to allow for most soluble proteins to adsorb onto the bead surface. Therefore the bulk of the protein found in typical virus pools (cell culture supernatants, e.g. pyrogens and most contaminating proteins, as well as nucleic acids and endotoxins) are washed from the column and a degree of purification of the bound virus is achieved.

[0110] Inactivated viruses may be further purified by gradient centrifugation, or density gradient centrifugation. For commercial scale operation a continuous flow sucrose gradient centrifugation would be an option. This method can be used to purify antiviral vaccines and is known to one skilled in the art.

[0111] Additional purification methods which may be used to purify viruses of the invention include the use of a nucleic acid degrading agent, a nucleic acid degrading enzyme, such as a nuclease having DNase and RNase activity, or an endonuclease, such as from Serratia marcescens, membrane adsorbers with anionic functional groups or additional chromatographic steps with anionic functional groups (e.g. DEAE or TMAE). An ultrafiltration/dialfiltration and final sterile filtration step could also be added to the purification method.

[0112] The purified immunogenic preparations described herein can be substantially free of contaminating proteins derived from the cells or cell culture and can comprise less than about 1000, 500, 250, 150, 100, or 50 pg cellular nucleic acid/.mu.g virus antigen, and less than about 1000, 500, 250, 150, 100, or 50 pg cellular nucleic acid/dose.

[0113] In one aspect, vaccination of animals may be performed by directly injecting the PRV polypeptides, fragments or variants thereof into the animal to generate an immunogenic response. In certain embodiments, the PRV polypeptides can be injected by themselves, or as immunogenic PRV compositions comprising other components, including, for example, excipients, additives and adjuvants.

[0114] To produce the immunogenic preparations described herein, the PRV nucleic acid sequences of the invention can be delivered to cultured cells, for example by transfecting cultured cells with plasmids or expression vectors containing PRV nucleic acid sequences, or by infecting cultured cells with recombinant viruses containing PRV nucleic acid sequences. PRV polypeptides may then be expressed in a host cell or expression system and purified. A host cell may be a cell of bacterial origin, e.g. Escherichia coli, Bacillus subtilis and Lactobacillus species, in combination with bacteria-based plasmids as pBR322, or bacterial expression vectors as pGEX, or with bacteriophages. The host cell may also be of eukaryotic origin, e.g. yeast-cells in combination with yeast-specific vector molecules, or higher eukaryotic cells like insect cells (Luckow et al; Bio-technology 6: 47-55 (1988)) in combination with vectors or recombinant baculoviruses, plant cells in combination with e.g. Ti-plasmid based vectors or plant viral vectors (Barton, K. A. et al; Cell 32: 1033 (1983), mammalian cells like Hela cells, Chinese Hamster Ovary cells (CHO) or Crandell Feline Kidney-cells, also with appropriate vectors or recombinant viruses. In vitro expression systems, such as in-vitro transcription and in-vitro translation systems can also be used to generate the PRV polypeptides described herein. The purified proteins can then be incorporated into compositions suitable for administration to animals. Methods and techniques for expression and purification of recombinant proteins are well known in the art, and any such suitable methods may be used.

[0115] Vaccination may also be performed by direct vaccination with a DNA encoding a PRV polypeptide. When using such vaccines, the nucleic acid is administered to the animal, and the immunogenic polypeptide(s) encoded by the nucleic acid are expressed in the animal, such that an immune response against the proteins or peptides is generated in the animal. Subunit vaccines may also be proteinaceous vaccines, which contain the viral proteins or subunits themselves, or portions of those proteins or subunits. Any suitable plasmid or expression vector capable of driving expression of a polypeptide may be used. Plasmids and expression vectors can include a promoter for directing transcription of the nucleic acid. The nucleic acid sequence encoding PRV polypeptides may also be incorporated into a suitable recombinant virus for administration to the animal. Examples of suitable viruses include, but are not limited to, vaccinia viruses, retroviruses, adenoviruses and adeno-associated viruses. One of skill in the art will be able to select a suitable plasmid, expression vector, or recombinant virus for delivery of the PRV nucleic acid sequences of the invention. Direct vaccination with DNA encoding proteins has been successful for many different proteins. (As reviewed in e.g. Donnelly et al. The Immunologist 2: 20-26 (1993)).

[0116] Vaccination with the PRV nucleic acids and polypeptides described herein can also be performed using live recombinant carriers capable of expressing the polypeptides described herein. Live recombinant carriers are micro-organisms or viruses in which additional genetic information, e.g. a nucleic acid sequence encoding a PRV polypeptide, or a fragment thereof has been cloned. Fish infected with such live recombinant carriers will produce an immunological response not only against the immunogens of the carrier, but also against the PRV polypeptide or PRV polypeptide fragment. Non-limiting examples of live recombinant carriers suitable for use with the methods described herein includes Vibrio anguillarum (Singer, J. T. et al. New Developments in Marine Biotechnology, p. 303-306, Eds. Le Gal and Halvorson, Plenum Press, New York, 1998), and alphavirus-vectors (Sondra Schlesinger and Thomas W. Dubensky Jr. Alphavirus vectors for gene expression and vaccines. Current opinion in Biotechnology, 10:434439 (1999)

[0117] Alternatively, passive vaccination can be performed by raising PRV antibodies in a first animal species (e.g. a rabbit), from antibody-producing cell lines, or from in-vitro techniques before administering such antibodies (in purified or unpurified form) to second animal species (e.g. a teleost). This type of passive vaccination can be used when the second animal is already infected with a PRV. In some cases, passive vaccination can be useful where the infection in the second animal cannot, or has not had sufficient time to mount an immune response to the infection.

[0118] Many methods for the vaccination of teleosts are known in the art. For example. Vaccination with the PRV nucleic acids and polypeptides described herein can be performed in teleosts by injection, immersion, dipping or through oral administration. The administration protocol can be optimized in accordance with standard vaccination practice

[0119] For oral vaccination of teleosts, the PRV nucleic acids, polypeptides or immunogenic compositions described herein can be mixed with feed, coated on the feed or be administered in an encapsulated form. In certain embodiments, vaccination may be performed by incubating live feed such as Artemia nauplii, copepods or rotifers in a PRV vaccine suspension prior to feeding an animal (e.g. a teleost) such that ingestion of the live feed will cause the PRV vaccine to accumulate in the digestive tract of the animal undergoing vaccination. One skilled in the art will appreciate that these methods of administration may expose an antigen to potential breakdown or denaturation and thus the skill artisan will ensure that the method of vaccination will be appropriate for a chosen antigen. In the case of oral vaccination, the vaccine may also be mixed with one or more carriers. Carriers suitable for use in oral vaccination include both metabolizable and non-metabolizable substances.

[0120] Vaccination of teleosts can also be performed by immersion protocols Skin and gill epithelia in fish have mucosal surfaces that contribute to the recognition of pathogens by adsorbing antigens. Adsorption in turn results in the activation of antibody producing cells as part of the immune response. Thus in one embodiment, vaccination of fish with the polypeptides described herein can be performed by immersing fish in water containing a PRV vaccine composition. At least two types of immersion vaccination can be used in conjunction with the polypeptides described herein. In dip vaccination, fish are immersed in water comprising for a short period of time (e.g. about 30 seconds) in a concentrated vaccine solution (e.g. 1 part vaccine, 9 parts water). In bath vaccination, immersion occurs for longer periods of time (e.g. several hours) in water containing lower vaccine concentrations. One skilled in the art will readily be able to determine the dilution of PRV vaccine and the duration of immersion sufficient to induce a immune reaction in an immersion protocol.

[0121] Another method for vaccinating teleosts with the PRV nucleic acids and polypeptides described herein is by injection vaccination. In injection vaccination, a vaccine is injected into the abdominal cavity of the fish. Although one skilled in the art can readily determine the proper injection point, a common site for needle insertion in salmon is the midline of the abdomen, one pelvic fin length in front of the base of the pelvic fins. In certain embodiments, the PRV nucleic acids, polypeptides or immunogenic compositions can be delivered into the body cavity of the fish in an oil emulsion, or other adjuvants or additives that enhance and/or prolong immune responses. In addition to intraperitoneal injection, injection vaccination can also be performed by intramuscular injection. One skilled in the art will appreciate that improper handling and needle insertion can cause mortality of fish and thus light anesthesia may be used during the vaccination process to reduce stress and mechanical injury to the animals. The skilled artisan will also appreciate that needles having the proper length and thickness can be important to ensure proper vaccination while avoiding secondary complications due to infection, inflammation or tissue damage.

[0122] The PRV nucleic acids, polypeptides or immunogenic compositions described herein can also be delivered in the form of an aerosol spray presentation from pressurized packs or a nebulizer, with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of a pressurized aerosol the dosage unit may be determined by providing a valve to deliver a metered amount. Capsules and cartridges may be formulated containing a powder mix of the compound and a suitable powder base such as lactose or starch.

[0123] The PRV nucleic acids, polypeptides or immunogenic compositions described herein can be administered in any immunologically effective amount sufficient to trigger an immune response in an animal. In certain instances, this amount can be between about 0.01 and about 1000 micrograms of the PRV nucleic acid, polypeptide or immunogenic composition per animal.

[0124] As used herein, the term "immunologically effective amount" refers to an amount capable of inducing, or enhancing the induction of, the desired immune response in an animal. The desired response may include, inter alia, inducing an antibody or cell-mediated immune response, or both. The desired response may also be induction of an immune response sufficient to ameliorate the symptoms of a PRV infection, reduce the duration of a PRV infection, and/or provide protective immunity in an animal against subsequent challenge with a PRV. An immunologically effective amount may be an amount that induces actual "protection" against PRV infection, meaning the prevention of any of the symptoms or conditions resulting from PRV infection in animals. An immunologically effective amount may also be an amount sufficient to delay the onset of symptoms and conditions associated with infection, reduce the degree or rate of infection, reduce in the severity of any disease or symptom resulting from infection, and reduce the viral load of an infected animal.

[0125] One of skill in the art can readily determine what is an "immunologically effective amount" of the compositions of the invention without performing any undue experimentation. An effective amount can be determined by conventional means, starting with a low dose of and then increasing the dosage while monitoring the immunological effects. Numerous factors can be taken into consideration when determining an optimal amount to administer, including the size, age, and general condition of the animal, the presence of other drugs in the animal, the virulence of the particular PRV against which the animal is being vaccinated, and the like. The actual dosage is can be chosen after consideration of the results from various animal studies.

[0126] The immunologically effective amount of the immunogenic composition may be administered in a single dose, in divided doses, or using a "prime-boost" regimen. The compositions may be administered by any suitable route, including, but not limited to oral, immersion, parenteral, intradermal, transdermal, subcutaneous, intramuscular, intravenous, intraperitoneal, intranasal, oral, or intraocular routes, or by a combination of routes. The skilled artisan will be able to formulate the vaccine composition according to the route chosen.

[0127] In addition to vaccination techniques, antibodies that bind PRV polypeptides described herein can also be generated by any other method known in the art. Exemplary alternative in-vitro antibody generation technologies, transgenic animal technologies and hybridoma technologies. See, e.g., Ausubel, et al., ed., Current Protocols in Molecular Biology, John Wiley & Sons, Inc., NY, N.Y. (1987-2001); Sambrook, et al., Molecular Cloning: A Laboratory Manual, 2.sup.nd Edition, Cold Spring Harbor, N.Y. (1989); Harlow and Lane, Antibodies, A Laboratory Manual, Cold Spring Harbor, N.Y. (1989); Colligan, et al., eds., Current Protocols in Immunology, John Wiley & Sons, Inc., NY (1994-2001); Colligan et al., Current Protocols in Protein Science, John Wiley & Sons, NY, N.Y., (1997-2001).

[0128] In-vitro technologies suitable for generating PRV binding antibodies include, but are not limited to, ribosome display, yeast display, and bacterial display technologies. Ribosome display is a method of translating mRNAs into their cognate proteins while keeping the protein attached to the RNA. The nucleic acid coding sequence is recovered by RT-PCR (Mattheakis, L. C. et al. 1994. Proc Natl Acad Sci USA 91, 9022). Yeast display is based on the construction of fusion proteins of the membrane-associated alpha-agglutinin yeast adhesion receptor, aga1 and aga2, a part of the mating type system (Broder, et al. 1997. Nature Biotechnology, 15:553-7). Bacterial display is based fusion of the target to exported bacterial proteins that associate with the cell membrane or cell wall (Chen and Georgiou 2002. Biotechnol Bioeng, 79:496-503). In comparison to hybridoma technology, phage and other antibody display methods afford the opportunity to manipulate selection against the antigen target in vitro and without the limitation of the possibility of host effects on the antigen or vice versa.

[0129] For example, antibodies that bind PRV polypeptides may be obtained by selecting from libraries, e.g. a phage library. A phage library can be created by inserting a library of random oligonucleotides or a library of polynucleotides containing sequences of interest, such as from the B-cells of an immunized animal (Smith, G. P. 1985. Science 228: 1315-1317). Antibody phage libraries contain heavy (H) and light (L) chain variable region pairs in one phage allowing the expression of single-chain Fv fragments or Fab fragments (Hoogenboom, et al. 2000, Immunol Today 21(8) 371-10). The diversity of a phagemid library can be manipulated to increase and/or alter the immunospecificities of the monoclonal antibodies of the library to produce and subsequently identify additional, desirable, teleost antibodies. For example, the heavy (H) chain and light (L) chain immunoglobulin molecule encoding genes can be randomly mixed (shuffled) to create new HL pairs in an assembled immunoglobulin molecule. Additionally, either or both the H and L chain encoding genes can be mutagenized in a complementarity determining region (CDR) of the variable region of the immunoglobulin polypeptide, and subsequently screened for desirable affinity and neutralization capabilities. Antibody libraries also can be created synthetically by selecting one or more framework sequences and introducing collections of CDR cassettes derived from antibody repertoires or through designed variation (Kretzschmar and von Ruden 2000, Current Opinion in Biotechnology, 13:598-602). The positions of diversity are not limited to CDRs but can also include the framework segments of the variable regions or may include other than antibody variable regions, such as peptides.

[0130] Other antibody generation techniques suitable for generating antibodies against the PRV polypeptide, or a fragment of a PRV polypeptide described herein include, the PEPSCAN technique described in Geysen et al (Patent Application WO 84/03564, Patent Application WO 86/06487, U.S. Pat. No. 4,833,092, Proc. Natl. Acad. Sci. 81: 3998-4002 (1984), J. Imm. Meth. 102, 259-274 (1987).

[0131] Pepsin or papain digestion of whole antibodies that bind PRV polypeptides can be used to generate antibody fragments that bind PRV polypeptides. In particular, an Fab fragment consists of a monovalent antigen-binding fragment of an antibody molecule, and can be produced by digestion of a whole antibody molecule with the enzyme papain, to yield a fragment consisting of an intact light chain and a portion of a heavy chain. An (Fab').sub.2 fragment of an antibody can be obtained by treating a whole antibody molecule with the enzyme pepsin, without subsequent reduction. An Fab' fragment of an antibody molecule can be obtained from (Fab').sub.2 by reduction with a thiol reducing agent, which yields a molecule consisting of an intact light chain and a portion of a heavy chain. Two Fab' fragments are obtained per antibody molecule treated in this manner.

[0132] Antibodies can be produced through chemical crosslinking of the selected molecules (which have been produced by synthetic means or by expression of nucleic acid that encode the polypeptides) or through recombinant DNA technology combined with in vitro, or cellular expression of the polypeptide, and subsequent oligomerization. Antibodies can be similarly produced through recombinant technology and expression, fusion of hybridomas that produce antibodies with different epitope specificities, or expression of multiple nucleic acid encoding antibody variable chains with different epitopic specificities in a single cell.

[0133] Antibodies may be either joined directly or indirectly through covalent or non-covalent binding, e.g. via a multimerization domain, to produce multimers. A "multimerization domain" mediates non-covalent protein-protein interactions. Specific examples include coiled-coil (e.g., leucine zipper structures) and alpha-helical protein sequences. Sequences that mediate protein-protein binding via Van der Waals' forces, hydrogen bonding or charge-charge bonds can also be used as multimerization domains. Additional examples include basic-helix-loop-helix domains and other protein sequences that mediate heteromeric or homomeric protein-protein interactions among nucleic acid binding proteins (e.g., DNA binding transcription factors, such as TAFs). One specific example of a multimerization domain is p53 residues 319 to 360 which mediate tetramer formation. Another example is human platelet factor 4, which self-assembles into tetramers. Yet another example is extracellular protein TSP4, a member of the thrombospondin family, which can form pentamers. Additional specific examples are the leucine zippers of jun, fos, and yeast protein GCN4.

[0134] Antibodies may be directly linked to each other via a chemical cross linking agent or can be connected via a linker sequence (e.g., a peptide sequence) to form multimers.

[0135] The antibodies described herein can be polyclonal or monoclonal. The antibodies can also be chimeric (i.e., a combination of sequences from more than one species, for example, a chimeric mouse-salmon immunoglobulin). Species specific antibodies avoid certain of the problems associated with antibodies that possess variable and/or constant regions form other species. The presence of such protein sequences form other species can lead to the rapid clearance of the antibodies or can lead to the generation of an immune response against the antibody by an antibody.

[0136] The antibodies described herein can be antibodies that bind to other molecules (antigens) via heavy and light chain variable domains, V.sub.H and V.sub.L, respectively. The antibodies described herein include, but are not limited to IgY, IgY(.DELTA.Fc)), IgG, IgD, IgA, IgM, IgE, and IgL. The antibodies may be intact immunoglobulin molecules, two full length heavy chains linked by disulfide bonds to two full length light chains, as well as subsequences (i.e. fragments) of immunoglobulin molecules, with or without constant region, that bind to an epitope of an antigen, or subsequences thereof (i.e. fragments) of immunoglobulin molecules, with or without constant region, that bind to an epitope of an antigen. Antibodies may comprise full length heavy and light chain variable domains, V.sub.H and V.sub.L, individually or in any combination.

[0137] The basic immunoglobulin (antibody) structural unit can comprise a tetramer. Each tetramer can be composed of two identical pairs of polypeptide chains, each pair having one "light" (about 25 kD) and one "heavy" chain (about 50-70 kD). The N-terminus of each chain defines a variable region of about 100 to 110 or more amino acids primarily responsible for antigen recognition. The terms variable light chain (V.sub.1) and variable heavy chain (V.sub.H) refer to these light and heavy chains respectively.

[0138] The antibodies described herein may exist as intact immunoglobulins or as a number of well characterized fragments produced by digestion with various peptidases. In particular, pepsin digests an antibody below the disulfide linkages in the hinge region to produce F(ab)'.sub.2, a dimer of Fab which itself is a light chain joined to V.sub.H-C.sub.H1 by a disulfide bond. The F(ab)'.sub.2 may be reduced under mild conditions to break the disulfide linkage in the hinge region thereby converting the F(ab)'.sub.2 dimer into an Fab' monomer. The Fab' monomer is essentially an Fab with part of the hinge region (see, Fundamental Immunology, W. E. Paul, ed., Raven Press, N.Y. (1993) for more antibody fragment terminology). While the Fab' domain is defined in terms of the digestion of an intact antibody, one of skill will appreciate that such Fab' fragments may be synthesized de novo either chemically or by utilizing recombinant DNA methodology. The Fab' regions may be derived from antibodies of animal or human origin or may be chimeric (Morrison et al., Proc Natl. Acad. Sci. USA 81, 6851-10855 (1984) both incorporated by reference herein) (Jones et al., Nature 321, 522-525 (1986), and published UK patent application No. 8707252, both incorporated by reference herein).

[0139] The antibodies described herein can include or be derived from any mammal, such as but not limited to, a fish, a human, a mouse, a rabbit, a rat, a rodent, a primate, or any combination thereof and includes isolated fish, human, primate, rodent, mammalian, chimeric, humanized and/or CDR-grafted or CDR-adapted antibodies, immunoglobulins, cleavage products and other portions and variants thereof. In one embodiment the antibody is purified.

[0140] The antibodies described herein include full length antibodies, subsequences (e.g., single chain forms), dimers, trimers, tetramers, pentamers, hexamers or any other higher order oligomer that retains at least a part of antigen binding activity of monomer. Multimers can comprise heteromeric or homomeric combinations of full length antibody, subsequences, unmodified or modified as set forth herein and known in the art. Antibody multimers are useful for increasing antigen avidity in comparison to monomer due to the multimer having multiple antigen binding sites. Antibody multimers are also useful for producing oligomeric (e.g., dimer, trimer, tertamer, etc.) combinations of different antibodies thereby producing compositions of antibodies that are multifunctional (e.g., bifunctional, trifunctional, tetrafunctional, etc.).

[0141] Specific examples of antibody subsequences include, for example, Fab, Fab', (Fab).sub.2, Fv, or single chain antibody (SCA) fragment (e.g., scFv). Subsequences include portions which retain at least part of the function or activity of full length sequence. For example, an antibody subsequence will retain the ability to selectively bind to an antigen even though the binding affinity of the subsequence may be greater or less than the binding affinity of the full length antibody.

[0142] An Fv fragment is a fragment containing the variable region of a light chain V.sub.L and the variable region of a heavy chain V.sub.H expressed as two chains. The association may be non-covalent or may be covalent, such as a chemical cross-linking agent or an intermolecular disulfide bond (Inbar et al., (1972) Proc. Natl. Acad Sci. USA 69:2659; Sandhu (1992) Crit. Rev. Biotech. 12:437).

[0143] Other methods of producing antibody subsequences, such as separation of heavy chains to form monovalent light-heavy chain fragments, further cleavage of fragments, or other enzymatic, chemical, or genetic techniques may also be used, provided that the subsequences bind to the antigen to which the intact antibody binds.

[0144] A single chain antibody ("SCA") is a genetically engineered or enzymatically digested antibody containing the variable region of a light chain V.sub.L and the variable region of a heavy chain, optionally linked by a flexible linker, such as a polypeptide sequence, in either V.sub.L-linker-V.sub.H orientation or in V.sub.H-linker-V.sub.L orientation. Alternatively, a single chain Fv fragment can be produced by linking two variable domains via a disulfide linkage between two cysteine residues. Methods for producing scFv antibodies are described, for example, by Whitlow et al., (1991) In: Methods: A Companion to Methods in Enzymology 2:97; U.S. Pat. No. 4,946,778; and Pack et al., (1993) Bio/Technology 11:1271.

[0145] The PRV nucleic acids, polypeptides and immunogenic compositions described herein can be used to generate antibodies that that inhibit, neutralize or reduce the activity or function of a polypeptide or a PRV. In certain aspects, the invention is directed to a method for treating an animal (e.g. a salmon), the method comprising administering to the animal PRV nucleic acids, polypeptides and immunogenic compositions, or administering to the animal an antibody which specifically binds to a PRV polypeptide such that the activity or function of a PRV polypeptide or a PRV is inhibited, neutralized or reduced.

[0146] In another aspect, the invention described herein relates to PRV immunogenic compositions comprising PRV polypeptides or PRV nucleic acids. In some embodiments, the PRV immunogenic compositions can further comprise carriers, adjuvants, excipients and the like. The PRV immunogenic compositions described herein can be formulated readily by combining the active compounds with immunogenically acceptable carriers well known in the art. The PRV immunogenic compositions described herein can be formulated in a conventional manner using one or more physiologically acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used to induce an immunogenic response. Such carriers can be used to formulate suitable tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions and the like. In one embodiment, the immunogenic composition can be obtained by solid excipient, grinding a resulting mixture, and processing the mixture of granules, after adding suitable auxiliaries, if desired, to obtain tablets or dragee cores.

[0147] The immunogenic composition described herein can be manufactured in a manner that is itself known, e.g. by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or lyophilizing processes. Proper formulation is dependent upon the route of administration chosen.

[0148] When a immunogenetically effective amount of a PRV immunogenic composition is administered to an animal, the composition can be in the form of a pyrogen-free, parenterally acceptable aqueous solution. The preparation of such parenterally acceptable protein or other active ingredient solutions, having due regard to pH, isotonicity, stability, and the like, is within the skill in the art. For example, PRV immunogenic compositions described herein can contain, in addition to protein or other active ingredient of the present invention, an isotonic vehicle such as Sodium Chloride Injection, Ringer's Injection, Dextrose Injection, Dextrose and Sodium Chloride Injection, Lactated Ringer's Injection, or other vehicle as known in the art. The immunogenic composition of the present invention may also contain stabilizers, preservatives, buffers, antioxidants, or other additives known to those of skill in the art. The PRV immunogenic compositions can be formulated in aqueous solutions, physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer. For transmucosal administration, penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.

[0149] When the PRV immunogenic compositions is administered orally, protein or other active ingredient of the present invention can be in the form of a tablet, capsule, powder, solution or elixir. When administered in tablet form, the immunogenic composition of the invention may additionally contain a solid carrier such as a gelatin or an adjuvant.

[0150] The PRV immunogenic compositions described herein can encode or contain any of the PRV proteins or peptides described herein, or any portions, fragments, derivatives or mutants thereof, that are immunogenic in an animal. One of skill in the art can readily test the immunogenicity of the PRV proteins and peptides described herein, and can select suitable proteins or peptides to use in subunit vaccines.

[0151] The PRV immunogenic compositions described herein comprise at least one PRV amino acid or polypeptide, such as those described herein. The compositions may also comprise one or more additives including, but not limited to, one or more pharmaceutically acceptable carriers, buffers, stabilizers, diluents, preservatives, solubilizers, liposomes or immunomodulatory agents. Suitable immunomodulatory agents include, but are not limited to, adjuvants, cytokines, polynucleotide encoding cytokines, and agents that facilitate cellular uptake of the PRV-derived immunogenic component.

[0152] The PRV immunogenic compositions described herein can also contain an immunostimulatory substance, a so-called adjuvant Adjuvants in general comprise substances that boost the immune response of the host in a non-specific manner. A number of different adjuvants are known in the art. Examples of adjuvants frequently used in fish and shellfish farming are muramyldipeptides, lipopolysaccharides, several glucans and glycans and Carbopol.RTM. (a homopolymer). An extensive overview of adjuvants suitable for fish and shellfish vaccines is given in the review paper by Jan Raa (Reviews in Fisheries Science 4(3): 229-288 (1996)).

[0153] The PRV immunogenic compositions described herein may also comprise a so-called "vehicle". A vehicle is a compound to which the protein adheres, without being covalently bound to it. Such vehicles are e.g. biomicrocapsules, micro-alginates, liposomes and macrosols, all known in the art. A special form of such a vehicle, in which the antigen is partially embedded in the vehicle, is the so-called ISCOM (EP 109.942, EP 180.564, EP 242.380). In addition, the vaccine may comprise one or more suitable surface-active compounds or emulsifiers, e.g. Span or Tween. Certain organic solvents such as dimethylsulfoxide also may be employed.

[0154] The PRV immunogenic compositions described herein can also be mixed with stabilizers, e.g. to protect degradation-prone proteins from being degraded, to enhance the shelf-life of the vaccine, or to improve freeze-drying efficiency. Useful stabilizers are i.e. SPGA (Bovarnik et al; J. Bacteriology 59: 509 (1950)), carbohydrates e.g. sorbitol, mannitol, trehalose, starch, sucrose, dextran or glucose, proteins such as albumin or casein or degradation products thereof, and buffers, such as alkali metal phosphates.

[0155] When administered in liquid form, a liquid carrier such as water, petroleum, oils of animal or plant origin such as peanut oil, mineral oil, soybean oil, or sesame oil, or synthetic oils may be added. The liquid form of the immunogenic composition may further contain physiological saline solution, dextrose or other saccharide solution, or glycols such as ethylene glycol, propylene glycol or polyethylene glycol. When administered in liquid form, the immunogenic composition contains from about 0.5 to 90% by weight of protein or other active ingredient of the present invention, and from about 1 to 50% protein or other active ingredient of the present invention.

[0156] The PRV immunogenic compositions described herein include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a plasticizer, such as glycerol or sorbitol. The push-fit capsules can contain the active ingredients in admixture with filler such as lactose, binders such as starches, and/or lubricants such as talc or magnesium stearate and, optionally, stabilizers. In soft capsules, the active compounds may be dissolved or suspended in suitable liquids, such as fatty oils, liquid paraffin, or liquid polyethylene glycols. In addition, stabilizers may be added.

[0157] The PRV immunogenic compositions described herein can also be formulated for parenteral administration by injection, e.g., by bolus injection or continuous infusion. Formulations for injection may be presented in unit dosage form, e.g., in ampules or in multi-dose containers, with an added preservative. The compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilizing and/or dispersing agents.

[0158] The PRV immunogenic compositions described herein can also be in the form of a complex of the protein(s) or other active ingredient of present invention along with protein or peptide antigens.

[0159] The PRV immunogenic compositions described herein can be made suitable for parenteral administration and can include aqueous solutions comprising PRV nucleic acids or polypeptides in water-soluble form. Additionally, suspensions of the active compounds may be prepared as appropriate oily injection suspensions. Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides, or liposomes. Aqueous injection suspensions may contain substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran. Optionally, the suspension may also contain suitable stabilizers or agents which increase the solubility of the compounds to allow for the preparation of highly concentrated solutions. Alternatively, the active ingredient maybe in powder form for constitution with a suitable vehicle, e.g., sterile pyrogen-free water, before use.

[0160] The PRV immunogenic compositions described herein can also be in the form of a liposome in which protein of the present invention is combined, in addition to other acceptable carriers, with amphipathic agents such as lipids which exist in aggregated form as micelles, insoluble monolayers, liquid crystals, or lamellar layers in aqueous solution. Suitable lipids for liposomal formulation include, without limitation, monoglycerides, diglycerides, sulfatides, lysolecithins, phospholipids, saponin, bile acids, and the like. Preparation of such liposomal formulations is within the level of skill in the art, as disclosed, for example, in U.S. Pat. Nos. 4,235,871; 4,501,728; 4,837,028; and 4,737,323, all of which are incorporated herein by reference.

[0161] The PRV immunogenic compositions described herein can also be formulated as long acting formulations administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection. The compositions may be delivered using a sustained-release system, such as semipermeable matrices of solid hydrophobic polymers containing the therapeutic agent. Various types of sustained-release materials have been established and are well known by those skilled in the art. Sustained-release capsules may, depending on their chemical nature, release the compounds for a few weeks up to over 100 days. Depending on the chemical nature and the biological stability of the therapeutic reagent, additional strategies for protein or other active ingredient stabilization may be employed. Thus, for example, the compounds may be formulated with suitable polymeric or hydrophobic materials (for example, as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.

[0162] Carriers for use with the PRV immunogenic compositions described herein can be a co-solvent systems comprising benzyl alcohol, a nonpolar surfactant, a water-miscible organic polymer, and an aqueous phase. The co-solvent system may be the VPD co-solvent system. VPD is a solution of 3% w/v benzyl alcohol, 8% w/v of the nonpolar surfactant polysorbate 80, and 65% w/v polyethylene glycol 300, made up to volume in absolute ethanol. The VPD co-solvent system (VPD:5W) consists of VPD diluted 1:1 with a 5% dextrose in water solution. This co-solvent system dissolves hydrophobic compounds well, and itself produces low toxicity upon systemic administration. The proportions of a co-solvent system may be varied considerably without destroying its solubility and toxicity characteristics. The identity of the co-solvent components can also be varied: for example, other low-toxicity nonpolar surfactants may be used instead of polysorbate 80; the fraction size of polyethylene glycol may be varied; other biocompatible polymers may replace polyethylene glycol, e.g. polyvinyl pyrrolidone; and other sugars or polysaccharides may substitute for dextrose.

[0163] The immunogenic compositions also may comprise suitable solid or gel phase carriers or excipients. Examples of such carriers or excipients include but are not limited to calcium carbonate, calcium phosphate, various sugars, starches, cellulose derivatives, gelatin, and polymers such as polyethylene glycols. Many of the active ingredients of the invention may be provided as salts with immunogenically compatible counter ions. Such immunogenically acceptable base addition salts are those salts which retain the biological effectiveness and properties of the free acids and which are obtained by reaction with inorganic or organic bases such as sodium hydroxide, magnesium hydroxide, ammonia, trialkylamine, dialkylamine, monoalkylamine, dibasic amino acids, sodium acetate, potassium benzoate, triethanol amine and the like.

[0164] Excipients suitable for use in the immunogenic compositions described herein include fillers such as sugars, including lactose, sucrose, mannitol, or sorbitol; cellulose preparations such as, for example, maize starch, wheat starch, rice starch, potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropylmethyl-cellulose, sodium carboxymethylcellulose, and/or polyvinylpyrrolidone (PVP). If desired, disintegrating agents may be added, such as the cross-linked polyvinyl pyrrolidone, agar, or alginic acid or a salt thereof such as sodium alginate. Dragee cores are provided with suitable coatings. For this purpose, concentrated sugar solutions may be used, which may optionally contain gum arabic, talc, polyvinyl pyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures. Dyestuffs or pigments may be added to the tablets or dragee coatings for identification or to characterize different combinations of active compound doses.

[0165] The immunogenic compositions and vaccines described herein can also be multivalent immunogenic compositions that further comprise additional polypeptides or nucleic acid sequences encoding additional polypeptides from other viruses.

[0166] The immunogenic compositions and vaccines described herein can also be multivalent immunogenic compositions that further comprise additional polypeptide fragments or nucleic acid sequences encoding additional polypeptide fragments from other viruses.

[0167] The immunogenic compositions and vaccines described herein can also be multivalent immunogenic compositions that further comprise additional viruses (e.g. viruses that are either attenuated, killed or otherwise deactivated) or nucleic acid sequences encoding additional viruses (e.g. viruses that are either attenuated, killed or otherwise deactivated).

[0168] The immunogenic compositions and vaccines described herein can also comprise fusions proteins, or nucleic acids encoding fusion proteins comprising a PRV polypeptide, or a fragment thereof, and a polypeptide, or a polypeptide fragment from another virus.

[0169] Examples of other viruses, viral polypeptides of other viruses or fragments thereof, that can be included in the immunogenic compositions include, but are not limited to, Sleeping disease virus (SDV), or SDV viral polypeptides or fragments thereof; salmon pancreas disease virus (SPDV), or SPDV viral polypeptides or fragments thereof; infectious salmon anemia (ISAV), or ISAV viral polypeptides or fragments thereof; Viral hemorrhagic septicemia virus (VHSV), or VHSV viral polypeptides or fragments thereof; infectious hematopoietic necrosis virus (IHNV), or IHNV viral polypeptides or fragments thereof; infectious pancreatic necrosis virus (IPNV), or IPNV viral polypeptides or fragments thereof; spring viremia of carp (SVC), or SVC viral polypeptides or fragments thereof; channel catfish virus (CCV), or CCV viral polypeptides or fragments thereof; Aeromonas salmonicida, or Aeromonas salmonicida polypeptides or fragments thereof; Renibacterium salmoninarum, or Renibacterium salmoninarum polypeptides or fragments thereof; Moritella viscosis, or Moritella viscosis polypeptides or fragments thereof; Yersiniosis, or Yersiniosis polypeptides or fragments thereof; Pasteurellosis, or Pasteurellosis polypeptides or fragments thereof; Vibro anguillarum, or Vibro anguillarum polypeptides or fragments thereof; Vibrio logei, or Vibrio logei polypeptides or fragments thereof; Vibrio ordalii, or Vibrio ordalii polypeptides or fragments thereof; Vibrio salmonicida, or Vibrio salmonicida polypeptides or fragments thereof; Edwardsiella ictaluri, or Edwardsiella ictaluri polypeptides or fragments thereof; Edwardsiella tarda, or Edwardsiella tarda polypeptides or fragments thereof; Cytophaga columnari, or Cytophaga columnari polypeptides or fragments thereof; or Piscirickettsia salmonis, or Piscirickettsia salmonis polypeptides or fragments thereof.

[0170] For example, the cDNA encoding structural protein-1 of infectious salmon anemia virus (ISAV) described in U.S. Pat. No. 6,471,964. ISAV antigens are also disclosed in WO 01/10469. SPDV antigens are disclosed in WO 99/58639. P. salmonis antigens are disclosed in WO 01/68865. Whitespot Virus antigens disclosed in WO 01/09340.

[0171] Other viral polypeptides and nucleic acid sequence suitable for use in the immunogenic compositions described herein are discussed in Tucker et al. (2000) "Assessment of DNA vaccine potential for juvenile Japanese flounder Paralichthys olivaceus, through the introduction of reporter genes by particle bombardment and histopathology" Vaccine 19(7-8):801-809; Corbeil et al. (1999) "Evaluation of the protective immunogenicity of the N, P, M, NV, G proteins of infectious hematopoietic necrosis virus in rainbow trout Oncorhynchus mykiss using DNA vaccines" Dis. Aquat. Organ 39(1):29-26; Nusbaum et al. (2002) "Protective immunity induced by DNA vaccination of channel catfish with early and late transcripts of the channel catfish herpes virus (IHV-1)" Vet Immunol. Immunopathol 84(3-4):151-168; Clark et al. (1992) "Developmental expression of surface antigen genes in the parasitic cilate Ichtyophthirius multifiliis" Proc. Natl. Acad. Sci. 89(14):6363-6367; and Sato et al. (2000) "Expression of YAV proteins and vaccination against viral ascites among cultured juvenile yellowtail" Biosci. Biotechnol. Biochem. 64(7):1494-1497. Numerous nucleic acid and amino acid sequences of fish pathogen antigens are known and accessible through the Genbank databases and other sources.

[0172] Other additives that are useful in vaccine formulations are known and will be apparent to those of skill in the art.

[0173] The following examples illustrate the present invention, and are set forth to aid in the understanding of the invention, and should not be construed to limit in any way the scope of the invention as defined in the claims which follow thereafter.

EXAMPLES

Example 1

Isolation of PRV Fragment

[0174] A 200 nt fragment that is approximately 50% homologous at the amino acid level to mammalian Orthoreoviruses was obtained through high throughput sequencing of samples obtained from farmed salmon with HSMI in Norway. Quantitative PCR assays of muscle tissue from salmon with HSMI and normal salmon reveals a higher viral load in salmon with HSMI.

Example 2

Heart and Skeletal Muscle Inflammation of Farmed Salmon is Associated with Infection with a Novel Reovirus

[0175] RNA extracted from heart of a salmon with experimentally induced HMSI was pyrosequenced (Margulies, M. et al., Nature 437, 376-380 (2005)) yielding 106,073 reads ranging in size up to 598 nucleotide (average=349.7, SD=149.5). Although database alignment analysis at the nucleotide level revealed no evidence of infection, the predicted amino acid sequence of one 265 nucleotide read was 49% similar to the core-spike protein .lamda.2 of Mammalian orthoreovirus 3 (AF378009). A real time PCR assay based on this sequence was used to test for the presence of the candidate virus in RNA extracts of heart and serum obtained from salmon with HSMI in association with spontaneous outbreaks (n=20) or experimental infection (n=20), and in non-infected control fish (n=20). All samples from salmon with HSMI contained the candidate sequences. No sequences were found in the control salmon without HSMI.

[0176] The HSMI serum sample with the highest genetic load by PCR (3.0.times.106 genome copies/.mu.l) was selected for additional pyrosequencing yielding 120,705 reads. A suite of bioinformatic tools was used to identify viral sequences. In the first phase of analysis, BLASTN and BLASTX (Altschul et al., J Mol Biol 215, 403-410 (1990)) detected 1.5% and 53.9% of the predicted viral genome, respectively, enabling identification of segments L1, L2, L3, M1, M2 and M3 (FIG. 1). Implementation of FASTX (Pearson et al., Genomics 46, 24-36(1997)) yielded an additional 5.5% of the genome and detected motifs in the S1 segment as well as additional sequences in the L2 and M3 segments. Frequency Analysis of Sequence Data (FASD) (Trifonov et al, (submitted)), a program that predicts taxonomy based on nucleotide frequency and order rather than sequence alignment, detected new sequences representing the S1, S2, S3 and S4 segments (FIG. 1) that comprised an additional 11.8% of the final viral genome assembly. In total, approximately 17 kilobases of sequence (72.8% of the genome) was obtained by pyrosequencing (FIG. 1). Gaps between fragments and the termini of gene segments were completed by PCR cloning. All sequence was verified by classical dideoxy sequencing by using primers designed along the draft sequence.

[0177] Consistent with the genome organization characteristic for members of the family Reoviridae, the genome of the PRV comprises at least 10 RNA segments (GenBank Accession numbers GU994013-GU994022). Reoviruses are non-enveloped icosahedral viruses with double-stranded RNA genomes comprising 10-12 segments. Twelve genera are defined based on host range, number of genome segments, G/C content, and antigenic relationships. A phylogenetic tree constructed using L gene segment sequences of known reoviruses indicate that PRV represents a distinct genetic lineage branching off the root of the aquareovirus and orthoreovirus genera, viruses of fish and shellfish, reptiles, birds and mammals (FIG. 2). Analysis of all ten PRV gene segments confirmed the divergence of PRV sequence with respect to other Reoviruses (FIGS. 5 to 12). All PRV gene segments contained the 3' terminal nucleotides (UCAUC-3') found in orthoreoviruses and aquareoviruses (Attoui et al., J Gen Virol 83, 1941-1951 (2002)); however, the 5' terminal nucleotides (5'-GAUAAA/U) were unique.

[0178] The orthoreoviruses have polycistronic segments in either S1 or S4. Whereas aquareovirus species C are polycistronic in the S7 (the orthoreovirus S1 homolog), the other aquareovirus species are not (Attoui et al., J Gen Virol 83, 1941-1951 (2002)). PRV has a putative open reading frame (ORF) in the 5'-end of S2 (71 aa, pI=8.8, 8 kDa), and a putative ORF in 5'-end of S1 (124 aa, pI=4.8, 13 kDa). Although homologues of the .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.NS sequences of PRV are found in orthoreoviruses and aquareoviruses, the .sigma.1 and .sigma.3 sequences and the small putative open reading frames observed in S2 and S1 appear distinctive. The structure of the latter is similar to a fusion-associated small transmembrane (FAST) reovirus protein (Shmulevitz et al., EMBO J 19, 902-912 (2000)) (FIG. 13). Reovirus FAST proteins are nonstructural, single-pass membrane proteins that induce cell-cell fusion and syncytium formation (Shmulevitz et al., EMBO J 19, 902-912 (2000)). Taken together these data provide compelling evidence that PRV is the prototype of a new reovirus genus equally distant to the orthoreovirus and aquareovirus genera.

[0179] The prevalence of PRV infection in farmed and wild salmon was examined using real time PCR assays targeting genome segments L1, L2, M3 and S4. Levels of viral RNA were quantitated using an MGB assay against L1 wherein results were normalized to elongation factor 1A (EF1A) using the formula by Pfaffl (Pfaffl et al., Nucleic Acids Res 29, e45 (2001)). Heart and kidney samples from 29 salmon representing three different HSMI outbreaks were studied (Table 1) and 10 samples from healthy farmed fish. Twenty-eight of the 29 (96.5%) known HSMI samples and none of the 10 (0%) healthy salmon samples were positive as defined by L1/EF1A gene log ratio.gtoreq.5.00. Only one of 29 HSMI samples was negative; this sample originated from a salmon net harboring fish in the early phase of HSMI, prior to the onset of fish mortality (FIG. 3). In fish with signs of severe disease, including abnormal swimming behavior, anorexia and histologic evidence of pancarditis and myositis (Kongtorp et al., J Fish Dis 29, 233-244 (2006)), the median adjusted L1/EF1A gene log ratio was 10.36 (IQR, 0.94). The L1/EF1A gene log ratio was correlated not only with the presence or absence of HSMI, but also, with severity of disease at the time of sampling. The log ratios were lowest in healthy farmed salmon (log ratio range, -0.23 to 3.89; n=10), higher in salmon collected in the early phase of an HSMI outbreak (range, 4.34 to 7.66; n=10), and highest in salmon obtained at the peak of an HSMI outbreak (range, 8.52 to 11.90; n=10). To study the prevalence and relative levels of PRV in healthy wild salmon from different geographic locations, 66 samples obtained from nine coastal rivers in Norway were tested. PRV was detected in only sixteen of these samples (24.2%). Two of these sixteen samples were positive by the cutoff established for farmed salmon with relative log ratios of 6.70 and 7.58; the other fourteen had L1/EF1A log ratios well below the 5.00 cutoff (range, -0.20 to 4.57). No PRV transcripts were detected in any of the remaining wild salmon samples (n=50).

TABLE-US-00001 TABLE 1 Viral burden data. Outbreak log group/ L1/EF1A L1/EF1A Positive/ Sample Fish Disease disease gene ratio gene Virus negative ID type status phase Tissue (adjusted).sup.a ratio.sup.b detection.sup.c (min = 5.00).sup.d 408-1 Farmed HSMI Farmed Heart/ 3.3E+08 8.52 + Positive HSMI - kidney peak phase 408-2 Farmed HSMI Farmed Heart/ 1.1E+10 10.06 + Positive HSMI - kidney peak phase 408-3 Farmed HSMI Farmed Heart/ 6.4E+09 9.80 + Positive HSMI - kidney peak phase 408-4 Farmed HSMI Farmed Heart/ 1.8E+09 9.26 + Positive HSMI - kidney peak phase 408-5 Farmed HSMI Farmed Heart/ 5.5E+10 10.74 + Positive HSMI - kidney peak phase 408-6 Farmed HSMI Farmed Heart/ 7.1E+09 9.85 + Positive HSMI - kidney peak phase 408-7 Farmed HSMI Farmed Heart/ 6.9E+10 10.84 + Positive HSMI - kidney peak phase 408-8 Farmed HSMI Farmed Heart/ 8.0E+11 11.90 + Positive HSMI - kidney peak phase 408-9 Farmed HSMI Farmed Heart/ 5.2E+10 10.71 + Positive HSMI - kidney peak phase 408-10 Farmed HSMI Farmed Heart/ 4.6E+10 10.67 + Positive HSMI - kidney peak phase SK300 Farmed HSMI Farmed Heart/ 2.8E+10 10.45 + Positive HSMI kidney outbreak SK301 Farmed HSMI Farmed Heart/ 1.6E+09 9.20 + Positive HSMI kidney outbreak SK302 Farmed HSMI Farmed Heart/ 1.9E+09 9.28 + Positive HSMI kidney outbreak SK303 Farmed HSMI Farmed Heart/ 1.9E+07 7.28 + Positive HSMI kidney outbreak SK304 Farmed HSMI Farmed Heart/ 2.7E+08 8.44 + Positive HSMI kidney outbreak SK305 Farmed HSMI Farmed Heart/ 2.6E+07 7.42 + Positive HSMI kidney outbreak SK306 Farmed HSMI Farmed Heart/ 5.6E+08 8.75 + Positive HSMI kidney outbreak SK307 Farmed HSMI Farmed Heart/ 5.9E+08 8.77 + Positive HSMI kidney outbreak SK308 Farmed HSMI Farmed Heart/ 2.0E+09 9.29 + Positive HSMI kidney outbreak 562-1 Farmed HSMI Farmed Heart/ 1.4E+06 6.14 + Positive HSMI - kidney early phase 562-2 Farmed HSMI Farmed Heart/ 1.5E+06 6.16 + Positive HSMI - kidney early phase 562-3 Farmed HSMI Farmed Heart/ 1.3E+06 6.10 + Positive HSMI - kidney early phase 562-4 Farmed HSMI Farmed Heart/ 9.6E+05 5.98 + Positive HSMI - kidney early phase 562-5 Farmed HSMI Farmed Heart/ 2.2E+04 4.34 + Negative HSMI - kidney early phase 562-6 Farmed HSMI Farmed Heart/ 1.6E+07 7.22 + Positive HSMI - kidney early phase 562-7 Farmed HSMI Farmed Heart/ 4.6E+07 7.66 + Positive HSMI - kidney early phase 562-8 Farmed HSMI Farmed Heart/ 1.5E+05 5.18 + Positive HSMI - kidney early phase 562-9 Farmed HSMI Farmed Heart/ 2.8E+05 5.44 + Positive HSMI - kidney early phase 562-10 Farmed HSMI Farmed Heart/ 1.2E+07 7.07 + Positive HSMI - kidney early phase PD Farmed Healthy Farmed Heart/ 7.6E+02 2.88 + Negative 3511 healthy kidney PD Farmed Healthy Farmed Heart/ 1.2E+02 2.07 + Negative 3512 healthy kidney PD Farmed Healthy Farmed Heart/ 2.5E+03 3.41 + Negative 3513 healthy kidney PD Farmed Healthy Farmed Heart/ 7.9E+03 3.90 + Negative 3514 healthy kidney PD Farmed Healthy Farmed Heart/ 4.8E+03 3.68 + Negative 3515 healthy kidney PD Farmed Healthy Farmed Heart/ 4.2E+01 1.62 + Negative 3516 healthy kidney PD Farmed Healthy Farmed Heart/ 4.5E+03 3.65 + Negative 3517 healthy kidney PD Farmed Healthy Farmed Heart/ 5.8E-01 -0.23 + Negative 3518 healthy kidney PD Farmed Healthy Farmed Heart/ 1.1E+03 3.02 + Negative 3519 healthy kidney PD Farmed Healthy Farmed Heart/ 2.1E+03 3.32 + Negative 3520 healthy kidney SF/08 Wild Healthy Wild Heart . . - Negative 350 healthy SF/08 Wild Healthy Wild Heart 4.5E+02 2.66 + Negative 351 healthy SF/08 Wild Healthy Wild Heart . . - Negative 353 healthy SF/08 Wild Healthy Wild Heart 5.0E+02 2.7 + Negative 354 healthy SF/08 Wild Healthy Wild Heart . . - Negative 315 healthy SF/08 Wild Healthy Wild Heart . . - Negative 316 healthy SF/08 Wild Healthy Wild Heart . . - Negative 319 healthy SF/08 Wild Healthy Wild Heart . . - Negative 321 healthy SF/08 Wild Healthy Wild Heart . . - Negative 325 healthy SF/08 Wild Healthy Wild Heart . . - Negative 332 healthy SF/08 Wild Healthy Wild Heart 6.3E-01 -0.2 + Negative 338 healthy SF/08 Wild Healthy Wild Heart . . - Negative 48 healthy SF/08 Wild Healthy Wild Heart . . - Negative 50 healthy SF/08 Wild Healthy Wild Heart . . - Negative 53 healthy SF/08 Wild Healthy Wild Heart . . - Negative 56 healthy SF/08 Wild Healthy Wild Heart . . - Negative 60 healthy SF/08 Wild Healthy Wild Heart 5.0E+03 3.7 + Negative 61 healthy SF/08 Wild Healthy Wild Heart . . - Negative 62 healthy SF/08 Wild Healthy Wild Heart . . - Negative 63 healthy SF/08 Wild Healthy Wild Heart 3.1E+03 3.49 + Negative 64 healthy SF/08 Wild Healthy Wild Heart . . - Negative 432 healthy SF/08 Wild Healthy Wild Heart . . - Negative 438 healthy SF/08 Wild Healthy Wild Heart . . - Negative 440 healthy SF/08 Wild Healthy Wild Heart . . - Negative 442 healthy SF/08 Wild Healthy Wild Heart 5.1E+02 2.71 + Negative 444 healthy SF/08 Wild Healthy Wild Heart . . - Negative 446 healthy SF/08 Wild Healthy Wild Heart . . - Negative 447 healthy SF/08 Wild Healthy Wild Heart 3.7E+04 4.57 + Negative 452 healthy SF/08 Wild Healthy Wild Heart . . - Negative 453 healthy SF/08 Wild Healthy Wild Heart . . - Negative 463 healthy SF/08 Wild Healthy Wild Heart . . - Negative 464 healthy SF/08 Wild Healthy Wild Heart . . - Negative 477 healthy SF/08 Wild Healthy Wild Heart . . - Negative 491 healthy SF/08 Wild Healthy Wild Heart . . - Negative 497 healthy SF/08 Wild Healthy Wild Heart . . - Negative 508 healthy SF/08 Wild Healthy Wild Heart . . - Negative 511 healthy SF/08 Wild Healthy Wild Heart . . - Negative 517 healthy SF/08 Wild Healthy Wild Heart 1.7E+01 1.23 + Negative 518 healthy SF/08 Wild Healthy Wild Heart . . - Negative 519 healthy SF/08 Wild Healthy Wild Heart . . - Negative 522 healthy SF/08 Wild Healthy Wild Heart 5.0E+06 6.7 + Positive 198 healthy SF/08 Wild Healthy Wild Heart . . - Negative 200 healthy SF/08 Wild Healthy Wild Heart . . - Negative 201 healthy SF/08 Wild Healthy Wild Heart . . - Negative 205 healthy SF/08 Wild Healthy Wild Heart . . - Negative 206 healthy SF/08 Wild Healthy Wild Heart . . - Negative 207 healthy SF/08 Wild Healthy Wild Heart 3.8E+07 7.58 + Positive 208 healthy SF/08 Wild Healthy Wild Heart . . - Negative 209 healthy SF/08 Wild Healthy Wild Heart . . - Negative 210 healthy SF/08 Wild Healthy Wild Heart . . - Negative 211 healthy 1-13 Wild Healthy Wild Heart 1.2E+01 1.08 + Negative healthy 1-14 Wild Healthy Wild Heart . . - Negative healthy 1-21 Wild Healthy Wild Heart . . - Negative healthy 1-22 Wild Healthy Wild Heart . . - Negative healthy 1-23 Wild Healthy Wild Heart . . - Negative healthy 1-24 Wild Healthy Wild Heart 1.7E+00 0.24 + Negative healthy 1H Wild Healthy Wild Heart 5.4E+01 1.73 + Negative healthy

2H Wild Healthy Wild Heart . . - Negative healthy 3H Wild Healthy Wild Heart . . - Negative healthy 1M Wild Healthy Wild Muscle 4.0E+01 1.6 + Negative healthy 2M Wild Healthy Wild Muscle . . - Negative healthy 3M Wild Healthy Wild Muscle 1.7E+02 2.23 + Negative healthy 1Mi Wild Healthy Wild Spleen . . - Negative healthy 2Mi Wild Healthy Wild Spleen . . - Negative healthy 3Mi Wild Healthy Wild Spleen . . - Negative healthy 521-6 Wild Healthy Wild Various 2.7E+00 0.42 + Negative healthy organs .sup.a= Ratio of virus burden (quantitated through the L1 viral gene), normalized using a salmon housekeeping gene (EF1A) and adjusted by a factor of 108. .sup.b= Log transformation of the adjusted ratio L1/EF1A. .sup.c= Virus detection by real time RT-PCR. .sup.d= For statistical analyses, samples were considered positive whenever the adjusted log ratio was higher than 5.00

[0180] The anatomic distribution of PRV in relation to pathology was tested through in situ hybridization using probes to L2 gene RNA. PRV RNA was distributed throughout the myocardium and endocardium of salmon with HSMI (FIG. 4A, 4B) but not detected in normal salmon or salmon infected with salmon pancreas disease virus (FIG. 4C, 4D)

[0181] Implication of a microbe in a disease via Koch's postulate requires demonstration that an agent is specific for that disease, and that disease can be reproduced in a naive host by inoculation with the agent propagated in culture following isolation from an affected host. Although fulfillment of this postulate is compelling evidence of causation the criteria are unduly stringent. Some agents cannot be cultured. Additionally, genetic and other factors may contribute to pathogenesis. PRV has not been cultured. Furthermore, PRV has been found in farmed fish that do not show clinical signs of HSMI. Moreover, PRV has been also detected in low quantities in wild Atlantic salmon. Nonetheless, the tissue distribution and load of PRV are correlated with disease in naturally and experimentally infected salmon. Analogies between commercial poultry production and Atlantic salmon aquaculture may be informative Reoviruses are also implicated in numerous diseases of poultry, including enteritis, myocarditis, and hepatitis (Jones, Rev Sci Tech 19, 614-625 (2000)). Both poultry production and aquaculture confine animals at high density in conditions that are conducive to transmission of infectious agents and may reduce resistance to disease by induction of stress.

[0182] Unlike terrestrial animal farming, where contact between domestic and free ranging wild animals of the same or closely related species is easily monitored and controlled, ocean based aquaculture is an open system wherein farmed fish may incubate and transmit infectious agents to already diminishing stocks of wild fish. PRV will be isolated in cell culture and prevention or modification of the disease will be performed disease through use of specific drugs or vaccines. Nonetheless, the results described herein show that a causal relationship can exists, measures to control PRV can be undertaken because PRV threatens domestic salmon production and also has the potential for transmission to wild salmon populations.

Example 3

PRV Identification and Sequencing

[0183] HSMI was experimentally-induced in normal Atlantic salmon by inoculation with heart and kidney extracts from fish with HSMI or cohabitation with fish with HSMI. RNA extracted from heart tissue from Atlantic salmon with experimentally-induced HSMI was used as template for high throughput pyrosequencing. Sequences were analyzed using a suite of bioinformatic applications available at the GreenePortal website (http://tako.cpmc.columbia edu/Tools), including FASD, a method whereby the statistical distribution of oligonucleotide frequencies within an unknown sequence set is compared to frequencies calculated for known sequence sets. Seven of ten segments of a novel reovirus, piscine reovirus (PRV), were identified using alignment and a motif-based program; three additional segments were identified using FASD. Quantitative real time PCR assays of samples from fish collected during outbreaks of HSMI and from fish with experimentally-induced HSMI confirmed association between PRV and HSMI. In situ hybridization confirmed the presence of PRV sequences in heart of fish with HSMI.

[0184] Identification of PRV by high-throughput sequencing Healthy Atlantic salmon produced at an experimental facility (VESO, Vikan; Namsos, Norway), with an average weight of 50 g were inoculated with cardiac tissue from field outbreaks of HSMI and served as donors for material for the high-throughput sequencing. Non-inoculated fish served as negative controls (Kongtorp and Taksdal, J Fish Dis 32, 253-262 (2009)). Three heart muscle biopsies were diluted 1:10 in HBSS, filtrated through a 0.22 .mu.m filter and inactivated in TRIzol LS reagent. Several serum samples were inactivated directly in TRIzol LS. Total RNA extracts were treated with DNase I and cDNA generated by using the Superscript II system for reverse transcription primed by random octamers that were linked to an arbitrary defined 17-mer primer sequence (Palacios et al., Emerg Infect Dis 13, 73-81 (2007)). The resulting cDNA was treated with RNase H and then randomly amplified by the polymerase chain reaction (PCR); applying a 9:1 mixture of a primer corresponding to the defined 17-mer sequence and the random octamer-linked 17-mer primer, respectively (Palacios et al., Emerg Infect Dis 13, 73-81 (2007)). Products >70 base pairs (bp) were selected by column purification and ligated to specific linkers for sequencing on the 454 Genome Sequencer FLX without fragmentation of the cDNA (Margulies, M. et al., Nature 437, 376-380 (2005); Palacios et al. N Engl J Med 358, 991-998 (2008); Cox-Foster et al., Science 318, 283-287 (2007)).

[0185] Removal of primer sequences, redundancy filtering, and sequence assembly were performed with software programs accessible through the analysis applications at the GreenePortal website (http://156.145.83 115/Tools). When traditional BLASTN, BLASTX and FASTX analysis failed to identify the origin of the sequence read, FASD was applied (Trifonov et al, (submitted)), a novel method based on the statistical distribution of oligonucleotide frequencies. The probability of a given segment to belong to a class of viruses is computed from their distribution of oligonucleotide frequencies in comparison with the calculated for other segments. A statistic measure was developed to assess the significance of the relation between segments. The p-value estimates the likelihood that an oligonucleotide distribution is derived from a different one. Thus, highly related distributions present a high p-value.

[0186] Conventional PCRs were performed with HotStar polymerase on PTC-200 thermocyclers an enzyme activation step of 5 min at 95.degree. C. was followed by 45 cycles of denaturation at 95.degree. C. for 1 min, annealing at 55.degree. C. for 1 min, and extension at 72.degree. C. for 1 to 3 min depending on the expected amplicon size. Amplification products were run on 1% agarose gels, purified and directly sequenced in both directions with ABI PRISM Big Dye Terminator 1.1 Cycle Sequencing kits on ABI PRISM 3700 DNA Analyzers.

Example 4

Sequence Analyses

[0187] Programs of the Geneious package (Biomatters, New Zealand) were used for sequence assembly and analysis. Sequences were downloaded from GenBank and aligned using the ClustalX (Thompson et al., Curr Protoc Bioinformatics Chapter 2, Unit 23 (2002)) implementation on the MEGA software (Tamura et al., Mol Biol Evol 24, 1596-1599 (2007)). The amino acid alignments obtained were further refined using T-Coffee (Notredame et al., J Mol Biol 302, 205-217 (2000)) to incorporate protein structure data on the alignment. To evaluate the robustness of the approach, the ability to find and align motifs previously identified as conserved among Reoviridae was used as a marker. Phylogenetic analysis were performed using p-distance as model of amino acid substitution as accepted by ICTV for analysis of the Reoviridae family. MEGA was used to produce phylogenetic trees, reconstructed through the Neighbor Joining (NJ) method.

[0188] The statistical significance of a particular tree topology was evaluated by bootstrap resampling of the sequences 1000 times. Bayesian phylogenetic analyses of the sequence differences among segments .lamda.1, .lamda.2, .lamda.3, .mu.1, .mu.2, .mu.3, .sigma.2 and .sigma.3 (.sigma.1 and .sigma.NS of aquareovirus and orthoreovirus had different genomic organizations) were conducted using the BEAST, BEAUti and Tracer analysis software packages.

[0189] Preliminary analyses were run for 10,000,000 generations with the Dayhoff amino acid substitution model to select the clock and demographic models most appropriate for each ORF. An analysis of the marginal likelihoods indicated that the relaxed lognormal molecular clock and constant population size model was chosen for all datasets. Final data analyses included MCMC chain lengths of 5,000,000-30,000,000 generations, with sampling every 1000 states (FIGS. 5-12).

Example 5

Real Time PCR

[0190] Quantitative assays were established based upon virus specific sequences obtained from the high throughput sequencing for several reovirus segments. Six different realtime assays were designed targeting genome fragment L1, L2 and M3 (SYBR green) as well as L1 and S4 (MGB assays) (See Table 2 for a list of the primers). Samples from different organs from experimentally infected fish were positive while samples from non-infected control fish were negative. For further screening, the real-time PCR for segment L1 was performed using the QIAGEN OneStep kit. Six .mu.l of template RNA were denatured (95.degree. C./5 min). Reactions were performed using the following concentrations: 400 nM primer, 300 nM probe and 1.25 mM MgCl.sub.2. Amplifications were done in a Stratagene M.times.3005P real-time PCR machine (Stratagene) with the following cycle parameters: 30 min at 50.degree. C. (reverse transcription), 15 min at 94.degree. C. (RT inactivation and PCR polymerase activation), 45 cycles of 94.degree. C./15 sec, 54.degree. C./30 sec and 72.degree. C./15 sec. Standard curves were created using RNA pooled from three fish with high viral loads. Standard curves were made in duplicates for both the MGB assay and the EF1A assay (Olsvik et al., BMC Mol Biol 6, 21 (2005)) and relative viral RNA loads for field samples were calculated by using normalization against EF1A.

TABLE-US-00002 TABLE 2 Primers for realtime assays for targeting genome fragment L1, L2 and M3 (SYBR green) as well as L1 and S4. Assay Target Sequence SEQ Primer name type segment (5'-3') ID NO AqureoGT70F SYBR L2 (1577- AGGATGTATGC SEQ ID green 1561) CACTAGCTCC NO: 11 AqureoGT70R SYBR L2 1513- GCTGGTAACTGG SEQ ID green 1536) CTTACTGCTAAT NO: 12 AquareoHC86F SYBR L1 (3832- ATGTCACAACTT SEQ ID green 3810) GAGTCAGTTCC NO: 13 AquareoHC86R SYBR L1 (3747- GATACAGCTACC SEQ ID green 3770) CAACATGATTGA NO: 14 AquareoNS86F SYBR M3 (2119- TCAGTGCGGGGA SEQ ID green 2096) ACTCTAGTGGCA NO: 15 AquareoNS86R SYBR M3 (2025- GACGACCTTGAA SEQ ID green 2048) CGCACGAGCGTG NO: 16 Salmon_Reo_F SYBR L2 (1767- TGCTGGCGATGAT SEQ ID green 1792) CTTGGAGTATGC NO: 17 Salmon_Reo_R SYBR L2 (1908- ACACCATCAGTGAA SEQ ID green 1935) CTTAGGAGCAACA NO: 18 L1_2671F MGB L1 (3219- TGCTAACACTCC SEQ ID assay 3241) AGGAGTCATTG NO: 19 L1_2729R MGB L1 (3277- TGAATCCGCTG SEQ ID assay 3257) CAGATGAGTA NO: 20 L1_MGB probe MGB L1 (3243- FAM-CGCCGGTA SEQ ID assay 3256) GCTCT-MGBNFQ NO: 21 S4_F1 MGB S1 (399- ACAGTCGCGG SEQ ID assay 417) TTCAAACGA NO: 22 S4_R2 MGB S1 (460- AAGGCGTCGC SEQ ID assay 441) TTAGCTTCAA NO: 23 S4 MGB probe MGB S1 FAM-AGACCA SEQ ID assay (419-433) GACAGACGC- NO: 24 MGBNFQ ELAF TAQMAN Elonga- CCACAGACAA SEQ ID tion GCCCCTTCGT NO: 25 ELAR TAQMAN factor A CCTTCAGGGTT SEQ ID CCAGTCTCCA NO: 26 ELA probe TAQMAN FAM-AGGTACA SEQ ID GTTCCAATACC NO: 27 ACCGATTT TGTAAACG- TAMRA

Example 6

In Situ Hybridization

[0191] In situ hybridization was performed in compliance with the protocol from GeneDetect (Auckland, New Zealand) with some modifications using LNA probes targeting L2. Sections were permeabilized using 40 .mu.g ml-1 Proteinase K in TE buffer at 37.degree. C. for 15 min followed by hybridization with a mixture of two 5' and 3' double DIG labeled LNA probes (5'-CACCATCAGTGAACTTAGGAGCAAC-3' and 5'-CATACTCCAAGATCATCGCCAGCA-3') (SEQ ID NO: 28 and SEQ ID NO: 41, respectively) (250 nM each) for 18 hours at 50.degree. C. Stringency washes were carried out at 60.degree. C.

[0192] Sections were incubated with a mouse monoclonal anti-DIG-HRP overnight at 4.degree. C. and stained using a Tyramide Signal Amplification System (Perkin Elmer, MA, USA) according to the manufacturer's protocol. Sections were counterstained with Meyer's hematoxylin solution. Negative controls included were samples from non-infected fish from experimental trial, head kidney samples from non-infected fish as a source of immune cells, salmon with pancreatic disease (a differential diagnosis to HSMI), and samples from material sent for diagnostics at random.

Example 7

Statistical Analysis

[0193] StatView version 5.0.1 software for Windows (SAS Institute, Cary, N.C., USA) was used for all statistical analyses. Samples without detectable L1 viral gene transcripts were excluded from statistical analysis. Log transformations were performed for all other samples after calculating L1/EF1A ratios (adjusted by a factor of 108). Log-transformed data were retained to facilitate graphical display of group differences, though distributions were not normalized by this method; thus, nonparametric analytic approaches were employed (Mann-Whitney U-test for comparison of healthy and HSMI fish; Kruskal-Wallis for comparisons of healthy and early, middle and peak phase HSMI fish). For all tests, statistical significance was assumed where p<0.05.

Example 8

Propagation of Virus in Cell Culture

[0194] Syncytium formation and vacuolization can be observed after infecting epithelioma paplosum cyprini (EPC) cells and fat head minnow (FHM) cells with tissue homogenate from HSMI diagnosed fish, however the cytopathic effect (CPE) is rarely seen after 2 to 4 passages.

Example 9

Challenge of Atlantic Salmon

[0195] Experimental challenge by injecting Atlantic salmon with material from HSMI diagnosed fish shows pathological changes consistent with HSMI.

Example 10

Electron Microscopy

[0196] Virus-like particles of 60 to 80 nm diameter are been observed in necrotic cardiomyocytes diagnosed with HSMI. Chloroform sensitivity analysis shows that PRV belongs to the Reoviridae family, which is a family of naked viruses.

Example 11

Screening of Heart Samples from Experimental Challenge

[0197] Heart samples were screened by RT-qPCR for quantification of virus after challenge of Atlantic salmon with tissue homogenate from HSMI diagnosed fish. 10 weeks post challenge (wpc), 4 of 5 fish were positive for the virus (Table 3). The results are consistent with the pathological findings.

TABLE-US-00003 TABLE 3 Quantification of virus in heart samples after challenge. Wpc 0 1 2 3 4 5 6 8 10 Positive 0/5 1/5 1/5 0/5 0/5 0/5 0/5 1/5 4/5 (Ct) (40) (38) (39) (21-36) Wpc = weeks post challenge.

Example 12

Immunization of Rabbits

[0198] The open reading frame (ORF), minus the 126 first nucleotides, of the M2 genomic segment (SEQ ID NO: 5) encoding the .mu.1 protein was cloned in the pET100 plasmid and expressed as His-tag fusion protein in E. coli, purified. The .mu.1 protein is posttranscriptionally cleaved into .mu.1c in mammalian orthoreovirus in a process wherein 42 aa are removed from the N-terminus of .mu.1. The protein was used for immunization of a rabbit to obtain polyclonal, .mu.1C-specific antiserum. The antiserum recognizes the .mu.1c protein as found in Western blots of E. coli His-tag fusion protein and different negative controls (FIG. 20). The antiserum recognizes PRV, as has been shown in immunohistochemistry of hearts of fish with HSMI.

[0199] The open reading frame (ORF), from nucleotide 29-1018 of the S1 genomic segment (SEQ ID NO: 2) encoding the .sigma.3 protein (330 amino acids long) (SEQ ID NO: 39) was cloned in the pET101 plasmid and expressed as His-tag fusion protein in E. coli, purified and used for immunization for a rabbit to obtain polyclonal, .sigma.3-specific antiserum. The antiserum recognizes the s3 protein as found in western blots of E. coli His-tag fusion protein and different negative controls. The antiserum recognizes native PRV, as has been shown in immunohistochemistry of heart of fish with HSMI.

[0200] The open reading frame (ORF), from the nucleotide 22-1281 of the S2 genomic segment (SEQ ID NO: 2) encoding the .sigma.1 protein (420 amino acids long) (SEQ ID NO: 35) was cloned in the pET101 plasmid and expressed as a His-tag fusion protein in E. Coli, purified and used for immunization of a rabbit to obtain polyclonal, .sigma.2-specific antiserum. The antiserum recognizes the .sigma.1 protein as found in western blots of E. coli His-tag fusion protein (FIG. 21) and in immunohistochemistry of hearts of fish with HSMO.

[0201] The open reading frame (ORF), from nucleotide 39-983 of the S4 genomic segment (SEQ ID NO: 3) encoding the .sigma.2 protein (SEQ ID NO: 38) (315 amino acids long) was cloned in the pET100 plasmid and expressed in E. coli. Purification of protein is ongoing.

[0202] Peptides were synthesized form the amino acid sequences of assumed antigenic region from the fusion-associated small transmembrane protein (FAST) protein (SEQ ID NO: 40) encoded by S1 (SEQ ID NO: 2) (nucleotide 108-479, +1 frame relative to the ORF of .sigma.3) and was used for immunization of a rabbit to obtain polyclonal FAST-specific antiserum. Currently it is being tested by immunohistochemistry of hearts of fish with HSMI of the antiserum recognizes PRV infected cells.

[0203] Rabbits were immunized (3.sup.rd booster) with recombinant proteins expressed in E. coli. The outer capsid proteins sigma-1 (SEQ ID NO: 35), sigma-3 (SEQ ID NO: 37) and mu-1C (SEQ ID NO: 33) were expressed and injected, in addition to a synthetic peptide of the FAST protein of S1 (SEQ ID NO: 40). Specific antibodies targeting the FAST protein can increase chances of culturing the virus, as the FAST protein is involved in syncytium formation.

[0204] The sera raised against the .mu.1, .sigma.3 and putative .sigma.2 proteins all give positive signals in immunohistochemistry of hearts from salmon with HSMI. The serum against the .mu.1 protein works best and gives a good signal to noise ratio in immunohistochemistry.

TABLE-US-00004 TABLE 4 Annotation of ORFs proteins. Based on in silico analysis. Putative Function of Genomic Segment of PRV Protein PRV Compared to MRV, PRV PRV Proteins SEQ ID NO ARV and GCRV L3 (SEQ ID NO: 9) .lamda.3, 144.3 kDa, 1286 aa SEQ ID NO: 31 RNA-dependent RNA polymerase L2 (SEQ ID NO: 10) .lamda.2, 143.7 kDa, 1290 aa SEQ ID NO: 30 Guanylyltransferase, methyltransferase L1 (SEQ ID NO: 8) .lamda.1, 141.1 kDa, 1282 aa SEQ ID NO: 29 Helicase, NTPase M1 (SEQ ID NO: 6) .mu.2, 86.1 kDa, 760 aa SEQ ID NO: 33 NTPase M2 (SEQ ID NO: 5) .mu.1, 74.2 kDa, 687 aa SEQ ID NO: 32 Outer capsid M3 (SEQ ID NO: 7) .mu.NS, 83.5 kDa, 752 aa SEQ ID NO: 34 dsRNA binding S2 (SEQ ID NO: 4) .sigma.1, 45.9 kDA, 420 aa SEQ ID NO: 35 Inner capsid (S2 ORF 1) S2 (SEQ ID NO: 4) .sigma.1s, 10.9 kDa, 71aa SEQ ID NO: 36 Inner capsid (S2 ORF 2) S4 (SEQ ID NO: 3) .sigma.2, 34.6 kDa, 315 aa SEQ ID NO: 38 Cell attachment, primary serotype determinant S3 (SEQ ID NO: 1) .sigma.NS, 39.1 kDa, 354 aa SEQ ID NO: 37 dsRNA binding S1 (SEQ ID NO: 2) .sigma.3 7.0 kDa, 330 aa SEQ ID NO: 39 Zinc mettaloprotein (S1 ORF 1) S1 (SEQ ID NO: 2) FAST 13.0 kDa, 124 aa SEQ ID NO: 40 FAST protein (S1 ORF 2)

Example 13

Virus Characterization and Virulence Studies

[0205] PRV virus segments were cloned and expressed in insect and fish cell lines to examine potential virulence factors virus characterization and virulence studies. The hemagglutinating properties of the virus will also be tested and samples from geographically distant areas will be sequenced to study potential differences and strain variations.

Example 14

Screening of Wild Fish and Fertilized Eggs

[0206] Material from the National Gene Bank will be screened for presence of the virus in wild salmon populations and examined for possible vertical transfer of virus.

Example 15

Screening of Brood Stocks

[0207] Material for screening of brood stocks kept under different conditions can be obtained, inter alia, from one or more commercial breeding companies.

REFERENCES

[0208] Kongtorp, R. T., Kjerstad, A., Taksdal, T., Guttvik, A. & Falk, K. Heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L: a new infectious disease. J Fish Dis 27, 351-358, doi:10.1111/j.1365-2761.2004.00549.xJFD549 [pii] (2004).

[0209] Ferguson, H. W., Kongtorp, R. T., Taksdal, T., Graham, D. & Falk, K. An outbreak of disease resembling heart and skeletal muscle inflammation in Scottish farmed salmon,

[0210] Salmo salar L., with observations on myocardial regeneration. J Fish Dis 28, 119-123, doi:JFD602 [pii] 10.1111/j.1365-2761.2004.00602.x (2005).

[0211] Kongtorp, R. T., Taksdal, T. & Lyngoy, A. Pathology of heart and skeletal muscle inflammation (HSMI) in farmed Atlantic salmon Salmo salar. Dis Aquat Organ 59, 217-224 (2004).

[0212] Watanabe, K. et al. Virus-like particles associated with heart and skeletal muscle inflammation (HSMI). Dis Aquat Organ 70, 183-192 (2006).

[0213] Margulies, M. et al. Genome sequencing in microfabricated high-density picoliter reactors. Nature 437, 376-380 (2005).

[0214] Altschul, S. F., Gish, W., Miller, W., Myers, E. W. & Lipman, D. J. Basic local alignment search tool. J Mol Biol 215, 403-410, doi:10.1006/jmbi.1990.9999 S0022283680799990 [pii] (1990).

[0215] Pearson, W. R., Wood, T., Zhang, Z. & Miller, W. Comparison of DNA sequences with protein sequences. Genomics 46, 24-36, doi:S0888-7543(97)94995-8 [pii] 10.1006/geno.1997.4995 (1997).

[0216] Trifonov, V. & Rabadan, R. Frequency analysis techniques for discovery of novel microorganisms. mBio (submitted).

[0217] Attoui, H. et al. Common evolutionary origin of aquareoviruses and orthoreoviruses revealed by genome characterization of Golden shiner reovirus, Grass carp reovirus, Striped bass reovirus and golden ide reovirus (genus Aquareovirus, family Reoviridae). J Gen Virol 83, 1941-1951 (2002).

[0218] Shmulevitz, M. & Duncan, R. A new class of fusion-associated small transmembrane (FAST) proteins encoded by the non-enveloped fusogenic reoviruses. EMBO J 19, 902-912, doi:10.1093/emboj/19.5.902 (2000).

[0219] Pfaffl, M. W. A new mathematical model for relative quantification in real-time RT-PCR. Nucleic Acids Res 29, e45 (2001).

[0220] Kongtorp, R. T., Halse, M., Taksdal, T. & Falk, K. Longitudinal study of a natural outbreak of heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L. J Fish Dis 29, 233-244, doi:JFD710 [pii] 10.1111/j.1365-2761.2006.00710.x (2006).

[0221] Jones, R. C. Avian reovirus infections. Rev Sci Tech 19, 614-625 (2000).

[0222] Thompson, J. D., Gibson, T. J. & Higgins, D. G. Multiple sequence alignment using ClustalW and ClustalX. Curr Protoc Bioinformatics Chapter 2, Unit 23, doi:10.1002/0471250953.bi0203s00 (2002).

[0223] Tamura, K., Dudley, J., Nei, M. & Kumar, S. MEGA4: Molecular Evolutionary Genetics Analysis (MEGA) software version 4.0. Mol Biol Evol 24, 1596-1599, doi:msm092 [pii] 10.1093/molbev/msm092 (2007).

[0224] Notredame, C., Higgins, D. G. & Heringa, J. T-Coffee: A novel method for fast and accurate multiple sequence alignment. J Mol Biol 302, 205-217, doi:10.1006/jmbi.2000.4042 S0022-2836(00)94042-7 [pii] (2000).

[0225] Mertens, P., Attoui, H., Duncan, R. & Dermody, T. Family Reoviridae. 447-454 (Elsevier Academic Press, 2005).

[0226] Kongtorp, R. T. & Taksdal, T. Studies with experimental transmission of heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L. J Fish Dis 32, 253-262, doi:JFD983 [pii] 10.1111/j.1365-2761.2008.00983.x (2009).

[0227] Palacios, G. et al. Panmicrobial oligonucleotide array for diagnosis of infectious diseases. Emerg Infect Dis 13, 73-81 (2007).

[0228] Palacios, G. et al. A new arenavirus in a cluster of fatal transplant-associated diseases. N Engl J Med 358, 991-998, doi:NEJMoa073785 [pii] 10.1056/NEJMoa073785 (2008).

[0229] Cox-Foster, D. L. et al. A metagenomic survey of microbes in honey bee colony collapse disorder. Science 318, 283-287, doi:1146498 [pii] 10.1126/science.1146498 (2007).

[0230] Olsvik, P. A., Lie, K. K., Jordal, A. E., Nilsen, T. O. & Hordvik, I. Evaluation of potential reference genes in real-time RT-PCR studies of Atlantic salmon. BMC Mol Biol 6, 21, doi:1471-2199-6-21 [pii] 10.1186/1471-2199-6-21 (2005).

[0231] Kongtorp R. T., Taksdal T. & Lyngoy A. (2004b) Pathology of heart and skeletal muscle inflammation (HSMI) in farmed Atlantic salmon Salmo salar. Diseases of Aquatic Organisms 59, 217-224.

[0232] Kongtorp R. T., Kjerstad A., Guttvik A., Taksdal T. & Falk K. (2004a) Heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L.: a new infectious disease. Journal of Fish Diseases 27, 351-358.

[0233] Eliassen T. M., Solbakk I. T., Evensen O. & Gravningen K. (2004) Isolation of heart and poster skeletal muscle inflammation virus (HSMIV) from salmon. 6th International Symposium on Viruses of Lower Vertebrates, Hokkaido, Japan.

[0234] Watanabe K., Karlsen M., Devoid M., Isdal E., Litlabc A. & Nylund A. (2006) Virus-like particles associated with heart and skeletal muscle inflammation (HSMI). Diseases of Aquatic Organisms 70, 183-192.

[0235] Kongtorp R. T., Halse M., Taksdal T. & Falk K. (2006) Longitudinal study of a natural outbreak of heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L. Journal of Fish Diseases 29, 233-244.

[0236] Studies with experimental transmission of heart and skeletal muscle inflammation in Atlantic salmon, Salmo salar L. Kongtorp R T, Taksdal T. J Fish Dis. 2009 March; 32(3):253-62. Epub 2009 Feb. 18. PMID: 19236557

Sequence CWU 1

1

4411143DNAPiscine reovirus 1gataattttg attgcataca ttcctatcat gtcgaacttt gatcttggac gtcaggctaa 60taagccaaaa actgaatatc acttgaatgc attaccttac ttgaaatgtg gaattaaaaa 120cagcgaatct gttggttctg taatcatcaa ctttcctgct cgtttcgaca ccgcaaagag 180cgtcagcccc ttatctgcaa tgactaatga tggcttcctc aagttcaagg acccttctga 240ctcccttgcc tctcgtgacc gtcctgcgtt caatgactat gtgcgtgcac ttcaaccatc 300gcctgagcat cctcaccatt tccaagcact tgaccctgcc ttcactgatg aaatcctgaa 360aacttgtgat cctactttca actggacatc catcaaaagt ggtgacaaat actaccttcc 420tgctatcagt caagctctag tgtatcgtgc ctctggcttt cgtttcaact ctgagaagca 480cctggaacaa actggttcat tattgcccat agctcttggt atcagcaaag caacatgcgc 540cctccctgtc cttgtggact ctggtacagt ggtctgtcct gaagagaatg tttctgcctt 600gttttcaaaa gacaaactct cctccctgga catccagttt ggatacccaa aaccaaagaa 660tggcaatgat tccactgcgt acacaaaatc catcaatggg taccagattg gtgcgtatgg 720tttgaagctt cctggaggtc atttcctcaa gctgattcac atcctcaact gcatgtgcct 780gaaagcagac ctggatcttc tgtctcaagt gccctccctg gcagattccc tcaatcgtgg 840aatgagatgt ggctatgccc tgcttcaata tgtttcccag ttcgccactg tggacagaga 900attgctcctg atgtctttcc tcctgaaaga ggctaacgac cccaccttcc atgaagttgc 960tgcaatgtgg aaatccgttc gtgatggtac cgctcaaatg gacgacgtgc gttttgacct 1020gcaacctttt ggcatcatgg cttcaactgc atcgctcagg gatggggttc gcatcatggc 1080catgttttgt tagaaaccgg atctccagcc ggggacttgc atacaatcga acatctcttc 1140atc 114321081DNAPiscine reovirus 2gataaagact tctgtacgtg aaacccaaat ggcgaaccat aggacggcga caactactga 60cttttctgat tttatagaat caactttaca cgggaatatt atcttctatg acgaccaaca 120taacacttca agcgagtgga tccctggtac cagcaagttt gttagggtcg gttcccttcg 180aatatgtgtt gaatgcgggc atcgggttgg tttgtctcat aatgctaagc ctgttatggt 240cactcatcaa tgcgacggcg atacgttgtg ggatcattct acacccggag attggacatg 300gagtgaatgg agctatttcg tcactagttg cgcaaatgcc ctttctgcga acgcagacgc 360ttacctcaga atcctcaatg acaaatggac agaagacaac agtcgcggtt caaacgacag 420accagacaga cgcggagtca ttgaagctaa gcgacgcctt agagacgata tgcgtggcat 480aatgaagaag aaaaccgctg gagaccttgg cttgactggc tggctgatcc ttgatcctga 540cgagttggaa tctttccctg actattcaac ggagatgaca cagctgcagg aagacatgga 600ggagctgaac ccagtggagc agaagactgg aaatggtgga aaagcgcacg tggcggccgc 660aaatcagttc ccacacaagg tcattctgcg tcctgcgtat ggcaccgttc ccatcgtgat 720gtacctggac acgcgtgaag atcacaacgc ctacctttgc ctctcattga aaacgaaagc 780gcacatggta aacatgatac gaaggatgtg ctattcgggc atgccagcca acatcatcaa 840aatgacgcaa ggaatggcac tctctggaat ggaggagatg acttttcgtt caggtcacag 900actttttggt cacatgcact ctggtcatac aatccctgtt aaaggaactt catcattgac 960attgacatct ggtaaatgct cacacacgtg tcagaatttg ctcaaatggt catcggcgtg 1020atggggagcc tactgtagac ataaaatcca ttgtctgagg gggaaggagg tcttattcat 1080c 108131040DNAPiscine reovirus 3gataaagatc ttaaccgcag cgacatctca gcttaaccat gcatagattt acccaagaag 60accatgttat tattaactca agacttgatg ccattgaaga ggacaacaag cggaacttcg 120cttcattgaa acaatcaatc cacaacaact acggattgct tcgcagcctg cttggaggtc 180aaggacgctt gaacgggaaa attggagatc tggagaagga cgtcaatctg atacatttga 240gagtggtttc cctggaacat gcgcttgatg atcttcgcgc tgattttgac gcttttactc 300caactgttgg tcctgagatt gacgacaaac tggctccgct ccagaaacag cttaaggtgc 360tgaatgacca gctcacaatc atgaactctg aggtcgctgt gttggggaaa gggatattcg 420gagactatca actgactgac ctgcttggac acactgttgg tggagttgcg gctgtgacga 480caaattcact cacaagcgcc ttccgcttga gcgaccgact gcctgcgact actgttggag 540atttcagtct atccactgga gtaggataca cctttgttgg gacggcacca aggccaatcc 600ttcaagttga agatttcatg cggggcacct gcaggatgaa tctcactgac actgcgctga 660tgtatggtgg tagccacatt ccactcctgc aacagtcact gcttcaactg gagacaacag 720ttcctcctgg cccgacagat tggaagaagc tgcctcaaat ggtgaaaggc gtgctctgga 780tgagtctggt ggattatgaa ggcgccaatg tagttcctgt ggtggtgatg aggaaggtta 840atgctacggt gacgactgtc attctcccag acatggttgg caagcaaaag ctgatttcct 900cgtttccctg gacgacaaga tcaacgttca tgagtcctgg aatggaggtg atcattcatg 960gtggagactt cgtgatcatc atctagcgtg gaagagccac gtgtcgcact ggagatattg 1020cggtaagcct gtttttcatc 104041329DNAPiscine reovirus 4gataaatttg ttggtgacga tatggctaga gcaattttct cgggtatttc tgcctttttc 60gcgaacgcac cttacgttca agatggcgac acaattaagc atgcattcct ttctggcgac 120tcactctttt tccaagggac caacacactg taccccacac tttccacaag ttatcaagga 180gatactgacc tcccaacccc atttactgtt atgtatcaga ctgctatggt ccggtctgcg 240ttatttcagg taccactctt cggcggactt tggaacgcaa gaagctatcg ggatttagtg 300ttcacttctc aggctatgct gaatgtcaag actaacacct ctgtcacctg ccctcctcct 360gtcataccgc gacctgcgta tgtctacaac gtgatgaata atcaaagatt cgcgcagagt 420gctacagcta ggaacaaagt ctatgtcgat ttttcaatca ccacattgtt tcagatggac 480atcaatggct tcgctcttcc tctcttgttc aatcctgatg acaatggtat agatgtgacc 540cttgcattga ctagccttgt gggacaatct tggagtacta tcgtcggtgc acgatatgaa 600agcgctggaa atgcggcaat ggatatagac aacccaatac atcgcacgaa cagagcactc 660atgctcctat acctgggtag cgcatgcgga tacttcaatc caacgatgac atggaatggc 720ttctattttc gtcaagctgg gaaaccaggc tcctggggcg ctgatttgga cccaatttta 780gttcgcggtg actctgctct catcaatcga gccacattcg ttcgtttgaa tcgttgggtt 840gtcttcaaag acttcctctg gcagatgtct cgtggaacat tgcatgctct ggtcctcgga 900ggaatgatct gcgctgttga gcaacctttg agaggtctga gcgttatttc agttttggca 960aatactgttt gcgcaccttg gactggtgtt aatggacgcg cgggggatga ggtaactacc 1020attggcttga agtacgttgc gatcgagaat ctgattcggt ctggtagtta caccgttgct 1080gaaggtgtgg tcgccgatgc ccaaattgcc gcttgggggg tccgcaacac agaccatatg 1140gatagagttc gtgctgctga tgacgctaac gtattagccg gagtcaacat cagacgcgtc 1200aagccctggg ataatggtgg tggattccaa agattggctg ctgtgagagc gttagtgaat 1260ctaatggcgg caaatacacg gtaactctag ccgggactga ccaccctgta gtcagcacgc 1320ctcttcatc 132952179DNAPiscine reovirus 5gataaatttg tttaacaggc ttgaccatgg gtaactatca gacaagtaac aaccaatttt 60gggtaactgg cgacggcaat gatttcagtg ctgaaggcgg actcgactct acgaacgcgg 120catcactcga ctttaaagct ggaaaaacga atcctggtgg tcacatgtat gtgatatccg 180gtgacaatac gtcagatgtc gtgaaatggg acagtttaac gcccttgtat gggatagatg 240gacagatggt tgttgtgctg actgcggtag ctatgtctac ttttgagaag atggtgaatt 300taattgagat gtatagacca ttacttgaag catcacagca gatggcttgt taccgtgatt 360ggaagaagga tattgtcctg cttgatggct atgttggtag tactcctcaa tctgctgtca 420ctaactttgt gactggggct agtgtaatca atctgagaga actgagaagc ctggggaaga 480tgtatcaaaa catactcggt gtcatagcta actatgatcg tgacattcaa gttgccctgt 540ccctgatccc tcattcaact ccaatcggta gtctgaccgc tgacatgcat tccattctga 600ggatgttctc cctctccctc aagccaacca atgtgtgcta cctctaccct gaagcggctc 660tgcaagtgat tcgagctatt tcaccgactg tcaggaatgt tgacactcaa caaggtggat 720caatagttga gactctcaat ctctttgaac ctgttttcaa tggcactgga cccaatcaac 780ctccactgac tgatcagagc gaagtccgtt caatcgcaag gtctgatgca tccctggctc 840aactctctct catctccagc acagaaccca ttgaagcaag agccctcaaa agtggcacac 900caacgaaaac gtacgacatt cgtctcgttg atcccctcac cacaccctgg gtatccaaag 960cgtacgcatt ggctgaaaag accgcacgaa tccaattcac tgacagtggt cgcaaaacct 1020ggtatactgc agttggcaaa ggaactctgg cattgcatct ggatgacatc actagcatgt 1080ctattacaat ggatctaggt ggtgagagct actactacaa gacgttagcg aacgacgcag 1140ctgaaactgt tgatcctgaa tctgccaccg ttgctttcat cttgttctca gtcacgaggc 1200ccctggagga gataaccact gcgtcagagc tgcagactgg gaagatcgtt gcttttgaga 1260aactcatggt cgcaaactcc agtgtgcagg gcgctaaaat cattgcaaac acttccctga 1320agtacaactt tgatcacaat tctatcagcg gcgacaaatc tgaattgaac cactacctgc 1380tgtgtcaact gctcttcaac aatctctctg catccaccac ctacactcaa caagacgcat 1440gggctgggaa gacgacaatg caatctctgg attcagataa ggtgacagtc aaaggggttg 1500aggttgacag agtcattcct gctggagcgt tcggtaacta cacaactgct gagcagaagt 1560cctcacttcc aaatgatctg cacagcgtca tggcaactca tcttgagaga gctgcaaaag 1620caatgacagc aattgatgat gaagatcaag agggtggatc gacagttgcc aatgcaatct 1680ttggagcact gatttcaaag gaatcacctg ttgctggacc gatcccctgg aagaacatca 1740agtttgacga gttgagagtt ttgtctgaca aggccgcttc aagtttcaag agagacccat 1800cgcaagctct gatttcacat gacccggtcc ttggagacag tgcagtgatg acatcgctac 1860ttggtggtat tggaaacgca gtcaagacga agggactatc tgccgcgtgc aaggatacga 1920agagtgcgtt gactgctgcc cagtcaggta gatctgtgag acagacgatt ctggacaaga 1980tagagaaact gtttccacca ggcccacgcc ctgcgaagaa aatgattgag gaaggaccat 2040ccaaaaagga agctaggcgt ctgggagact cacgtcgagg ccaaaaatag gttcccgcac 2100caccctggca gtacgttgta cgtgacaacg gtgctctgcg gcctgtttag cgggtgacac 2160cgaacgacaa atcttcatc 217962383DNAPiscine reovirus 6gataataact cctttgccac catgcctatc ataaacctgc caattgaacc tactgaccag 60agtattaccg aatttaagac gcaagcgcag accgtgtttt caggatgcat ggagaatact 120gatgtcacat ttgttgacta cctcaagagg gacgttaaaa tattcatcgt tgacaaccgt 180tttctgctgc cgcagatcgc gaagatgatt gattcgtcgg atcttgatga gattgccagc 240caagtgctaa acttaccatt acttagcgaa gcgtgcttca ttctacttcc tcccctttct 300gtgatggcta agaggcttct ttcctccagt gattcctacc ctgacatctt cctcactagg 360gttccaactc gcgtgctcaa agctcaatct gacaactcaa gatccactgc tctgctgaaa 420ttcatgccca aggttgttac gtcatccacg actgcctctg acatgctgac gatgtctgta 480cagaatgctg acgtttacac gttgaccccc gatgtcatcg gaatgccact tcgtcgctat 540gcagagaaat ctcattatcc ctcagctttt gattttggaa gtgcacatcc atcaaactgg 600cgtcgctcag tcatcaaggc ttcaaactct cttctgatac caatggtgcc ggtcatgtcc 660actgcgaaga ccttatatct ggacgccgat ttctcaactt ctgacgatag aactggcatc 720ttttggcgtc tttctgcctc tgcgcgtatt cgagctcgac aacgtggtgt gattgtactc 780ccctcaatga tcaaaacatt ctacgagaaa gaacgtggtc tgaagagcgc accagttcaa 840cttcgcagag aacacaaaat ggctgccaga ctcctgagga ttccttttgg acgagtgccc 900tccgaaactt cctttcgccg agacatggtt caatgttgtg atctgctcgt ttccacctct 960gtcctgaaca agcttttgag tccaaccgag gctggtaaat cacctccctt tgacaaatac 1020gtgtttcatg gtgtgccagt tgagttcatt aacagagtct gccctgacat cggtacacaa 1080gctctcggcc gagacaccaa tggatatctg caagaatggt tgattatgtt attcctgatg 1140tctgactata tcacctccac caccagccgc cggcgcctga ctcttgtcac caactttgac 1200ccaatgcgaa agtggtacga catcaccttg ctgaaaatca ccaataccta ctatcaatgt 1260caagagatga tgacgcctcc ggccatctct tcttttggtg tgtgcagtca gaaaggcact 1320ttcaagtcca ctctcagcag ctggttgtct caagtcatcg tgcgcggcgt caatctcttt 1380cctgaaggat cgattgtgga ctctgacgat cttggcagca aactggatcc aacattcgag 1440agtgagtggg agactaacgt catcgagaaa attggtatgc ctgtcatcat tcgtgggctc 1500acggaagaag gtgctttcaa gataaccact gacaccatgt ttgacacgta tgcactgttc 1560agacaactat acgatcggat gattgttcca gttgctcggc atttctttga ctactcagtc 1620gcatctggta ggaagatgat ctttgcgcat tgcgacagtg agttccttga caactctttc 1680ccttctccgt tctatcgcac tcacatcacg atcgacaact acggcaacat cctgaaccgt 1740ccaaaccgag ttggtggcgt tctaagccag tacgtacttg ctgagtgcta ccgtctcatg 1800gccacgtcct gcaaatccag accgattgcc aagctgttga aggctaagtt ggtgccctgg 1860tgggagtttg acagtcatgt gaagcggatg ggaggcacac ctgttcacta ctcacttgga 1920gtcaagattc aacctgagtt gatgagagac gctggatatt gtggtcatct gatcgatcat 1980gcgcgcgtcg aagtacttca agcgatgtgg gttcccgaag cagtggatga gagtttcttc 2040cataaccctc caagcatgcc attgaccatc catctggcgg attccaagta caacaggtat 2100gagcccatcg gtgaacacaa tttgaacatc cctgttctga tcgacacctc cacctcttac 2160ctttctgaga catatcttcc agctggagtc gtgttcacac caacaaaaag attcacagtg 2220gaggggtgtg actttaactg ctggaggggg aatccaatca ctttcaaggg tactctgagt 2280tggtggtcta cagctggtga gtgagtgcca tggggctcct gactacttca gatggtccgc 2340cggtcagcgg ctgaaggaat aaggggctta agagattttc atc 238372403DNAPiscine reovirus 7gataaagctt acgacacgtg acatccttac atgaactgtg aagactgact tactataact 60tactgaaact aactactact acaatggctg aatcaattac ttttggagga ccatctcgca 120agctggactt ggttgcatct gggagcaagc cgatcacagt cactgtgaca gttggagatc 180tgggctgcag tatctacgga accgttcctc gtggtactga tgaattcgtt acctctgatc 240gctatcttgc gatgtgccgt cacctgttgg tttttaagcc tacactgaac aatgggacac 300tgactcatta cactgcgttc tctgctatac gtagtatgat ttctcctctt ggatttggag 360tgatgcgcaa tgttgatgtt gttgagaagc agtgtgccat cattgaagct cttgaaagac 420gtgggatgtt gaatgaagtc aaggatgcgg ctgctgaatt acctcttcaa ttggatgtca 480ctgacacctc cacacatgtt gaccctgcga tcattgactc actcccccca ctgattcaaa 540atgaagttgc tgctggcctc acacctcttg agttgcctgc catcaccatg gttcaaaccg 600ctcccctgat cacccctgct cttggaatgg agaatgatga tttcaatctc tctcgctact 660tctttgcctc tggtttcatt gatcaagcct ccagaattgg cggtactgtg aatgatgaat 720acgtcaaagg attcatgcag gcccttcccc gtttcaacga tgatggctcc attcgtgtag 780attgtgatgt tctgacttgc ttgtgctccc gggatgaaga tttgtctgtt ttgacacctc 840tgtctgtcaa caccactgct gtttctgaca tgtttgagct gtcccatgat caccagccaa 900tggcctacct gcgcactgtg tatgtggaag actacattgc ctcacatctt gagtccctga 960aaaacagaga gaccgccact cctctcgtcc tgaagctgag cgctgtcaac agtgtcactc 1020cgaaagccct gatcgctctg gttgaatcca aagctactga ctcaatcttc aatcaggctg 1080acaaacgctg gatgattggt cttgatccca tgttctctga gtgctggcct ggggcaatcg 1140ctttgctttc aatgcttttt gatcacaagg ttgactactg gtctgttaga tgtcgtttca 1200tccttcgcag cgctctgatt ggcatgagtg atgatgacgc acgccctagg gttcagatga 1260tgcggatgca ctattccctg accacaccaa ctacctggta ttcaacgcgt ggcgtctact 1320ctgctgaagg tcgttccaaa attcactatg ccagcggaga ccgaatgaga ttgggactgc 1380gtgttggtga ggtgcgagat cgtcaagtca cgatgttgga ggacctttcc accattcact 1440ccatggatgt cgccaacatg aaggaccagg tcattcagaa agacgtgcag ctgaaggcgc 1500tgaccgaggc catgtcccag aaggattctc tcattgacag tctgcgagcg gatgttgctg 1560gattaactga gcgtgcagtc ttagttcaag ctgagcatct cactacgatt gctgacatgg 1620aagtgaggag agtccagtct gaggataagg ccaggattgg cattgacgca gcgaatcgcc 1680gagccggaga agccattgag agtgcccatc tcttgactga ggagttctcc aaatgtctca 1740gctctgactt cctgatggtg aaaccacttc ctgaacacaa ccaatgtcct gtgccgctgc 1800tggagtctgt ttggcctgca ttgtgtcaac gttacattca aaacatgcaa ctggttgatg 1860aaatctggac caacaagctt gctgatgcga ctgacaccat cgccactgaa atggctgagg 1920agacaatgag gatcattgcc gaaagagact gccaagctat ggtcatgcca gtggttgaag 1980caccaaaacc tcaaagaaaa cctcgcatct acgagccttc tgacgacgac cttgaacgca 2040cgagcgtgtc gagcaccagc agcgagaaga agaagcgagt catctggagt cgttctgcca 2100ctagagttcc ccgcactgat gtagactttt ctgcaatcac tgccgcaaga cgtgatgaac 2160atttcgaact ggggatgcct agagaaggaa gatatcctgt ccacagtggg attcctggca 2220gtgtgcgcgc aaccatgact cggggcctgg caatcgacag catgagtgag tttccaaaaa 2280tcatcgactt tggtggctca gatgactggg acgtgggcgt gaataatgtg ctacgtggct 2340gaatggtgta agtctgattc tatgttttcc ctaggtttgt acgtgtgagc tcccctcctc 2400atc 240383911DNAPiscine reovirus 8gataatgttt gttttgccat ggagcgactt aagaggaaag ataagtacaa aaatactaat 60actaaagaaa atacacaaga actgactgtt gacgaatctg ctgtatcttc caataatcct 120accggaaaaa ctacagacaa tggcggcgtc ggtaaaaatc ggggatcgtt accagctatt 180tcggcatcgg atagtgacag tagtgaagaa gaagcaattg ttgaggtaca gagaatcaag 240aagtcaaaag ctcagaagaa gagcactaaa ttggctacaa caactcaaaa tgactctaac 300gagagtaata ttgtaactca acctggcatg ggaatgtctg caaatgtgag taccatcaat 360gtgttgccac ctacagtgac tatgcctttg cagactactc aatcatctcc tggccctgca 420gttgatcaat ctggtgagac gaagttggga agatcgtcta acgttagtgg aaaagaggct 480gctatgcaag ctccggctgt cgaccgctct gagattactg ataaccctag gtacgatcct 540accacgtcta caggcactac atcctgccca ctttgcttca tgaccttaag ttctgttcct 600gatctgctac ttcacatttc tatgcgtcat gcacccattg acagcttttc cacgactgca 660ccacagattc aggatgctga gagacagttc attacaattt ggagtgcaca taacgctgca 720gctttgtcct cactttccac tggtctgacg actagttcaa gtttcttgtc taaggtgcct 780ccgcgtttat tcgtattcga tgatggaata tgctcatctt ttaggtttat gacggctgtt 840gaagctcgct atctgcctga agtacgtggc tacgcctggt atgatgagat ctatgacatc 900attctgcctt ttccagcttc agctgtggtt cgtatcgtac ttgacacgga ttgggctatg 960gttagtgatg aaacgttacc tattaaacta accacgcttt tacctactct ttcaaatgta 1020ggcttgttgc gtcaagttct cactgttctt tctgacaaca gtaaatacaa tcctgtttgg 1080gctcgcgcca acgtaatcgt gatgggtgtg aaatttatac ttgccaatct tgtcatcaac 1140agatctagtt cttgggctca agactctact ccctcggttt ctggcagact actacgcaca 1200gtccctggta aaccagaata ttggccattg atgtatccac gaaggacgct taacgctaat 1260gtcagcaaga tttcacgttt cgttgagcaa acacaggctg aacgcactgg cagagttgat 1320cgagcaatgc tttatcaagg agagaaagtc atctatactg acgttgctga gacctgcgat 1380acgttgaccg tgcgtttgcg tgacatgtgg actgggaaga ttttcaaaat gcattacaca 1440cattctgaca tcgctctggc tctatctgag tgcgctcgtg tggtctcctt ctcagctgtg 1500atggcgttat ccccacgcac aatacttcct tgtcgtgcga cgactgatga aagaaagctg 1560gcacaagttt tgaacatcgc tcgcctcggt gatctcagac tacgaattga gcctattatc 1620caatccgctg ctgacacttt aagatcagtt accatgctgg agatcaaccc caagattttg 1680actgctgtct tgaacagaat atgtgaaaat caaactcaat cagtgactgt gactgggaca 1740attcttcgtc tgctgagctc tgctaccaca gattcttctg ccttctggac ctgcatcgca 1800agttggttgt acaatgggat agttaccacc actcttcgtc aacaagatta ccctaacccc 1860actgcctcca tcacggatta cactgcactc tggtctgccc tgattgttag tcttgtttct 1920ccactcacca atgacccaaa tgctcctgtc aagatcttca tgactatggc gaatcttttc 1980aacggatatg aacgaattcc gatgaacaat gccagtatga cacaaggaac acctccctgg 2040gcattcaaca atcctaacaa atggccggcc tgcttcatcc aacctcgcaa cattaaccag 2100aacattgcgc cattcatgag agcctgggct gacttgatcc accgctactg gccacaacct 2160ggtgtcgtca actatggatc acctcaccac cttggtgcta ctgaactgct agttgaggat 2220ggacagatcg tcaccccgtt accagttcaa cctcaacagt ttgagtacgc tgcacttgat 2280cgtgacaatg agatgtctac ctggatcaac caagtttgca atttcttcat ccgctgcatc 2340aacggaacgg atcttcgtac cgcttctaac caagctactc agcaagcttt gatttctgcc 2400atctcacaat tgaagacctc cccatccctc acatatggat atatgtccag gtatttacca 2460tatgagttgg cgatgatttc acccacgctg gcgttacctc cattccaaat accattccag 2520cgtttgaatg tgaacgacat cgtttaccaa attggagtcc gtcgtcatgt ggtgagggat 2580caggttgaac ctgcacttga cacaagttcc acattagaga ccattggcca actgattgag 2640atcgatgctc aggccctgct cgtttcgctc ctttctggta ccatgaatgc taaggtcctg 2700ccatccgtcc actacgcaga gaaaatcact cctctttaca tggatgacga ctttttcgcc 2760cctcatcaaa gagccgtcgt cgtcagtgaa gcatactccc tagtacgcac catcatctca 2820cagatttcag acacgcgtgg accgcaactc aatcctctgg cttggatccc agctccaaac 2880gcatcatctc ctgtctcagc cgaagtagcc agactcgtca atgacatgat caaggaagct 2940tttgacatgc ctggtgaact gcttgaagga ttgatcggat atggtgaccc tagatacact 3000caagtcgaga ttgttgcaca

gaggtgtcgc gcggctccac ttcggttcga accactgatt 3060cctccgtctg ttctggctca agagcttcaa cttgttgaga acgtgatcac tgctgaacct 3120aatctgtttg gattggctac tggagactta tatctcgagc gcattgacac ttcagccggg 3180ttctctggtc tcaacgttat cggctgggag caatgggatg ctaacactcc aggagtcatt 3240gtcgccggta gctctctact catctgcagc ggattcaacg gagtagaccc aatgatcatg 3300gatgctgatg gggtggaacg gccgattacc ggtagatggg ttgtcacact ggaagcttgg 3360cgtagcagcg tggtcaccgt ccagaagttg ctgttaccaa ggatcagagc aggaaagttg 3420gctgtaagga tactggttgg tatttttcca tacaccatta actactatga acccgctgtt 3480ggtattgacg agtggaagct gttgtccgac tgggcgtcca tgtgtgaacc tacaggaata 3540ccggccatac ctttcactgc tccagttcca tctgatgtgt ccgttgtcac cgctgcgtgc 3600gtgaggtatc tgaggtgctc caccttcaac gaaggctcat tgatggctac taacgcagga 3660tcacctcgca ccgtgtttgg gcaatcagta gagtttgaca tcggcagatg gatgcagcta 3720tgtgatttga acactggagt cgacgagata cagctaccca acatgattga attctatcaa 3780atcttcagac gctacaacat cactcaaacg gaactgactc aagttgtgac attgactggg 3840actttgactc atcctgtact caactaagtg gctcggcgga acaggaggtt cacaaacatg 3900acaacttcat c 391193916DNAPiscine reovirus 9gataataatg gagaaaccta aagcgcttgt caaccaacta cctgaagact tggaaaacct 60gagtgtggca ctaagtggca ctatcgaatt aactgctgat atctggacta acgcgagtaa 120aacttttagg actacgcaaa gacatgaagt atatgacata attaataaaa ttgaatttat 180tgattctttc ttggttccgt catctctatt tcaaccacct ccacacaaaa gatattggga 240tgtcgacgtt cgccaacgag ttgtgcgtgt gcctaagtgt gcagttcctg atgatgtcta 300cctccctcac gctaatctca ctgacgtgct ggaaatcaat acagaatcta ttcacaagta 360tggtcaactg cggaaagaga ttcaagctgc ggctaaaaga ttggatccaa ctgcaaggat 420cgcagagacc ttttacaatc tttcagttta tcaagcaaac caaatcaaat ttcccctcga 480gagatttctc ttgtgtttag tagttagtta cgcccatgag ctgtctccct cacctctcct 540cattgatgaa cagaatgtta acttcttaac catagaagcc aacccagcac tttctgcatt 600gaaaaccatc atgttacact tcatggagta cgggaaatac aagccaccat tcttgaagac 660ttcacgcgac atcgtttttg ccctctatga tgacaaaaga cctctttcaa gtcaaatagc 720tccattgatg attgacctgg ttaactatgc gatagttatc tattcctgca acatttcccg 780ccttatcagc gttccaacgg tacgtatgat gcttaaagca gctgggacta cttcttacaa 840ccatactcaa ctaaagctga agaagatcat acccgccgct tcactactgt ctgtttatca 900tggtgagact gttggtcgtg tgcccatagt cgtttgggag gaacctagag aggaatatcg 960tttcagattg gatggtgcgc gtgatctccc tcgaggatgg aagaacgaac ttcaaggtgc 1020gaagaaggcg attgaggatg cttctgactt agctagtagt tatggcatga ctgctgaatt 1080tgaggaactt cgctctcagt actcaaagat atcagttcac aatggtgttg gcatgaagat 1140gatcagagat gcattggctg gtgtttcatc ggtattcata actcgcactc ccacagatac 1200agttcttcaa gagtatgttc atgctccagt cattgagcgc ccaattcccc cacaagattg 1260gaccgatccc gttggtgtgg taaaatacct gaagaatgac actcagcatt atgtggctcg 1320aaacttgtat gctacctggc gagaagctgc tgtccaagtt gccaacaatc ccgacaattg 1380ggacccaaac actcaggcca ttctgcgttc acaatacgta acacctcgcg gcggatcagg 1440aagtagtgtt aagaaggtgc tcactgataa aggtgtcata ttgaaaaact tctcaaaatc 1500tggcgctaag agctcaacaa aaatcgtcca agccgctcaa ctggcaagta taccattcac 1560gcaataccaa gacaccatca tggctcccgt ctctcatgga gtgagaattc aagttcagcg 1620tcgtagtcgg acgattatgc cattcagcgt tccacagcag caggtctccg ctcctcacac 1680tctctgcggc aactacatca acaagttctt gaataagagc acaacttcag gttccaacgt 1740caccgaaaag gtcattccac ttggtatctt cgcctcgtct ccacctactc gtgctgtcaa 1800cattgacatt aaagcttgtg attcttcgat cacttgggga ttcttcttgt ctgtcatctg 1860cggtgctatg catgaaggta tggatggaat caatgttggg acgccttttc ttggagtacc 1920tgccaccttg gttgaagacg gtcttgattt gggtattgtc ggcacacgga gcatctctgg 1980tatgcagaac atggttcaga agttgtctca actgtatgag cgggggtttg agtacgaagt 2040taaagatgct ttctctcctg ggaacgcctt cactcatcac actactacat ttccctctgg 2100ctctactgct acttccacgg aacatacagc gaacaatagt accatgatga aaacgttcct 2160gatgcactgg ttacctaatc acacgaagga tcttgaattg attgattttg tgaagaagct 2220tgatgtcaat cgtaactacg tttgccaagg agatgatggt atcatgatac tacccactaa 2280tgatggtcgt ccgatcagtt ctcatcatgt tgaatcaatg ctggaattgc tcagtgtgtt 2340cggtaaagag agtggatggg tttttgacat tgagtttaac ggatccgctg agtacttgaa 2400actgttgttt ttgaacggat gcaggatacc taatgtcggt cgtcaccctg tcgttggaaa 2460ggagcgggct agtcgtgatc aagatgtgat ttggcctggt ggcattgacg ctttcattgg 2520catgtacaac aatggagttg aggatcaatt tcactggcgt agatggttga agttctcatg 2580gtcgatggct tgtttccttt cttccaaggc agtcttcatt aagggaaaat ctgacgtgat 2640tcagtatcca tcctggtctt tcgtgtacct tgggctcccg ccaatacgca ttttcgactc 2700tccaccttgg atcttctctc catacactcc tggcggcgat ttagggatgt attccatcat 2760ggtcacaggt aagaagtaca tcgttgatcg catgcaatca agtggttatc agaaagacaa 2820cactgacttg tccaatgaat ctaccttctt ccggggatat gactacgtca agttcatgaa 2880tgattgcgga gttctgcctg ggtactacat gtcacaaata cctcgttcac ctgataagac 2940gaagagaaag gttattggtc ctgagtcacg tgacttgatt gatagtcttc gtaactactt 3000gttctcagat cagaagctca caatcagagt caactatgga catcgcatcg ttacggatta 3060tccaggccgc ttgccacgca aattaccatc tcttgacgac gtcccccaaa ggtggtttga 3120taccgcggtt gaagctgaca tggcgagcac gtatgagatc gaagcgatgg atgttcacct 3180tcttcgtggc cagttctcta ggtatcaatc cttttctaaa gtgttggaag cctacctgtc 3240cgtagattgg gagttgactg accttaacat accagcaggc ctgtcattgg atgttccact 3300agttgccggc tgtgacccta ctaatggtga accatactac aaaatgatgg gtctcggacc 3360aatgatggaa tccattcaaa cctacttcca cggcacagtg ttcatgagta gagctgtctc 3420tggtctcgat gttgagtcga tcgatgttgc tctcttgaag atgaaagcct tgaaagtccc 3480aactgaggtt atcactggat tcttaatgac ttgcggtcta tcaaaaccta aggcatccac 3540ggtcgccaca aaaatcaact tccaagacat gaaaacggtc caagtcgcaa aactcactgg 3600attaaatgtt tcggacaaat ggatgagcat gaattttgat cgtttgctgc actcctacgt 3660ggacgttaag acctatgttt ctgacagtag caatcagata cgtttacctg gcggagctgg 3720atggttgaga ggagtgatca gattccttgg agctggtgtt gtgatgacta gggttggacc 3780tcctcagccg gtgagaatct caatcattta tggcggcggt gcacggttgc atagcaaatt 3840ccttaattgg atggtgtccg atttttagcc cagggtaagt gcggggtagt tgggcttggg 3900ccgatccttc ttcatc 3916103935DNAPiscine reovirus 10gataattgta acgacgaaat ggctacgctt tatgggctac gcataacacg acttaagaac 60ttaccactac ttgaacgcga cactgaagaa tatacttata aagaaataat aacattttta 120acaactgatg ttgtgaaaag acttcgtcaa ttccaaaatg gagatcgcga atgttacgca 180gttcagctcc tctttcctct tacaggatgg tgtccttcag ttgatgtggt tgatggtact 240agttacaaca cgctcgggaa gttgattaac ttaatacaga ctagttgcgg attgctcgcc 300cgtcaactca atgtcaggta tcctttggtt ggtgcagcta attccatagt caattcactt 360gttatcacac aactagttga ttgcgcaatc cgtcatgaat caactgccgc tttgattgaa 420cacctttttg atgataatgg tcaaatttca tcgttaactg ttcacgctac aacctgggat 480gaagtcaagt taagcaaaaa tatgactgtg cgtcgacgtg ttgttgagtg tgttgctggg 540ctgaagtatt ggctgtttcg caacgttaaa ggagctaaga gctttgaaac atggggtaag 600gactatcctg gttatgccaa cgttcacttc ttcgatgatt ctgctggaaa acaagctgca 660atacgtcata ttgggaacga cgtgcacata ttccaacatt tcgacaatcc aacttacgct 720ccacacttgt atgtgccctt ggaaggaaac tattcacgcg acatgtatac tgatagtttc 780tccactctcg tgcagatgga atgtgtcgtt gatcaggcgc gtgctaactc taacagtgga 840ttgaagatgg tctctcgaag attcattgag gtgatgaaat gcatacaacg gccaatggga 900gagactggcg tatctatact ctcaaaattg gatgagattg gaactgtgtt ggctaatggc 960ggacagttcg agcttgctac cttagatcta agtcgtcgtg aggtgataca ttccatgatt 1020gacacgattt cagacacacc aaattcctca cgtgcaattc ctttcgacgc taccaggtta 1080gtcattttcc ttgacactgc ttacactgga cctatgcctt ctactgactt caatgtttca 1140acatatgagt tcgggttttc tttgattggt tcagtttctg gcaaagcttt ctcacgcccc 1200atacgttact ctccaaacta caaagatgac ctgggtgact tgcacgatgt taaggaactc 1260ctcagaacat tcgtgaaacg gaaagatgac gtcacgataa gtaacatttg ggacgggttt 1320cctttagtcg actttgctaa gtttggaaac gctgcgacca caccggttga tccacgtttg 1380aggaaggaat ttcccaatga ctactttgat cgggagcaat ctatcaaccg catgttgttt 1440cgtggttata gaaaaaccat tgatcgctca tgggcaaaag atcaggctgt tttggagact 1500atcttttcca ttgctggtaa ctggcttact gctaataagt cttatactgc tgcgtatttt 1560ggagctagtg gcatacatcc taatgacgac caacctctcg ttatcgatcc ctggtcaaag 1620ggcacaattt ttggtgttcc agccccatca tctaaggttt cccagtatgg atatgacgtt 1680tccaatggag tgattactga tctgactcga ccctcaccat ctggcacttt ttcattcatc 1740tattgcgacg tcgatcaggt tcaagatgct ggtgatgatc ttggagtgtg ctaccagata 1800gttcgcagtc ttttcgacac catcaatgac gctctgacta ctggaggttc ctttgtgatg 1860aagatcaact ttcccactag acaaatcatg gactatttgg ttgaggttgt cgctcccaag 1920ttcactgatg gtgttctgat taagccagtt gtgagtaaca acttggagtt gtttgttgga 1980tttttctgta aggtcgacaa tcgtggatgt cattggaatt ctgactgttc caggttcatg 2040ttcagactgc acaatcgcta caatcatctt gatcacgctt gtgactacat tccaattatt 2100ggcaacgcca gagaacatcc acgtgccatc tctcgtcagg agtttgccat cagaaatccg 2160actagctcta gtgacacttt gagccaagag attgaactga gtctcggtct gttttctcaa 2220cagtgtgcgg ctaacaccat caccatctca cgtaatctgt tacatggcat gacggaaata 2280cttgtcagtg gtgttgtgac cgcatcatcc cttaatcgtt gtgaaagact tgattacagt 2340cctaccattg actcaaccac cattctacat caacatcgcg aaatcgctac tgcctcacca 2400caactgttcc agttcgaagc atctgaatgg actctccttg ctatgggata caatgagttg 2460gccgctcggt ttgtcaatgg aagtgcgaaa tctctggttg atgttggtag tggtcctgaa 2520gggagaagca ttaactacgt tgattctgat atcaaagtta cactctttga tcaaaggaca 2580ccccacatca atgttgattg gttcgccaat gtggaataca ttcagggaga ttatcttcag 2640cgtagagatt ggcgtggttg cacctttgat actgccatat gcattttctc ctttggtgcc 2700gccactgctg gatctccaac gggtatgatt gaatacttaa ccgaacttct tgagatcttg 2760aaagacgccg gttgtactcg aatcatcatt cagctgaatt gccctctaat gaccaagccc 2820actggtgttg tgagtaagct ggaaatcgac gtgatcaatg acgattatta cttcatcaag 2880caaggaagag ttgagcccta cgctagccca caggatatat tgggagctat cacgcaagct 2940ttgcctcaat ctaccgttca gatcaagaca ctggatgacg aattgtcctg gttcccgcgc 3000atcatttcag aaggtttcag agtgaccaca gaagcaatga gagacgctat cacactttcc 3060aagttgctac ctctcttcct gatcgagact tcaaaaactc tcttccggcc tgcgaaatac 3120attggtctag ttgatgaagt gatcaccgca acttggactg ttactgaccc attcgttgac 3180gtctctgtct acctggaaga cacctctgtt ggattcttca atacgataga taatgaaatc 3240attggagttg aagttaaagc cgtgttcgat ggacgaggaa cgtatcgagg cactttctcg 3300actgacaaag ctggagtggt cacgtttgag cagacagaga aagatggcac atctaccata 3360cttggatctt tcctatgtgt gaccggccca aacgctgttg caatcacctg gcctgcaaac 3420gaagtcgttg gagataaccc aaacgtcgcc tctctcacca ataacactgg atacgaactg 3480atagtggcgt atgaatatga cgggacatgg attggagtga acgcttacaa ggctaatgtt 3540tacgaggacg ccgctggaga tgacaagatg gagtactatc acgtggttgg cgaggagaaa 3600ctggcttggg cattagtaga tcatcattat ggttctcctg gcgctcgtgt agtgatacct 3660ttcgtttggc ctgacgttac tgccttgcct ggtgatgtat tagtggctcc accttacgcc 3720ggtgactggt tggtgaacgt tgatgggaat ttaacggctg aattacacgt tgatgagcct 3780gatgagatac cagcactctg gactttaatg acacgctcag tagccaacaa tggcagctca 3840ctttcatata ttggccaagc tggtatctat acgttcttaa agttgccata gcagtggtca 3900taaaccgatg agccataggc cgttccttct tcatc 39351121DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 11gtagtgtatg ccactagctc c 211224DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 12gctggtaact ggcttactgc taat 241323DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 13atgtcacaac ttgagtcagt tcc 231424DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 14gatacagcta cccaacatga ttga 241524DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 15tcagtgcggg gaactctagt ggca 241624DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 16gacgaccttg aacgcacgag cgtg 241725DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 17tgctggcgat gatcttggag tatgc 251827DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 18acaccatcag tgaacttagg agcaaca 271923DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 19tgctaacact ccaggagtca ttg 232021DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 20tgaatccgct gcagatgagt a 212113DNAArtificial SequenceDescription of Artificial Sequence Synthetic probe 21cgccggtagc tct 132219DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 22acagtcgcgg ttcaaacga 192320DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 23aaggcgtcgc ttagcttcaa 202415DNAArtificial SequenceDescription of Artificial Sequence Synthetic probe 24agaccagaca gacgc 152520DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 25ccacagacaa gccccttcgt 202621DNAArtificial SequenceDescription of Artificial Sequence Synthetic primer 26ccttcagggt tccagtctcc a 212734DNAArtificial SequenceDescription of Artificial Sequence Synthetic probe 27aggtacagtt ccaataccac cgattttgta aacg 342825DNAArtificial SequenceDescription of Artificial Sequence Synthetic probe 28caccatcagt gaacttagga gcaac 25291282PRTPiscine reovirus 29Met Glu Arg Leu Lys Arg Lys Asp Lys Tyr Lys Asn Thr Asn Thr Lys 1 5 10 15 Glu Asn Thr Gln Glu Leu Thr Val Asp Glu Ser Ala Val Ser Ser Asn 20 25 30 Asn Pro Thr Gly Lys Thr Thr Asp Asn Gly Gly Val Gly Lys Asn Arg 35 40 45 Gly Ser Leu Pro Ala Ile Ser Ala Ser Asp Ser Asp Ser Ser Glu Glu 50 55 60 Glu Ala Ile Val Glu Val Gln Arg Ile Lys Lys Ser Lys Ala Gln Lys 65 70 75 80 Lys Ser Thr Lys Leu Ala Thr Thr Thr Gln Asn Asp Ser Asn Glu Ser 85 90 95 Asn Ile Val Thr Gln Pro Gly Met Gly Met Ser Ala Asn Val Ser Thr 100 105 110 Ile Asn Val Leu Pro Pro Thr Val Thr Met Pro Leu Gln Thr Thr Gln 115 120 125 Ser Ser Pro Gly Pro Ala Val Asp Gln Ser Gly Glu Thr Lys Leu Gly 130 135 140 Arg Ser Ser Asn Val Ser Gly Lys Glu Ala Ala Met Gln Ala Pro Ala 145 150 155 160 Val Asp Arg Ser Glu Ile Thr Asp Asn Pro Arg Tyr Asp Pro Thr Thr 165 170 175 Ser Thr Gly Thr Thr Ser Cys Pro Leu Cys Phe Met Thr Leu Ser Ser 180 185 190 Val Pro Asp Leu Leu Leu His Ile Ser Met Arg His Ala Pro Ile Asp 195 200 205 Ser Phe Ser Thr Thr Ala Pro Gln Ile Gln Asp Ala Glu Arg Gln Phe 210 215 220 Ile Thr Ile Trp Ser Ala His Asn Ala Ala Ala Leu Ser Ser Leu Ser 225 230 235 240 Thr Gly Leu Thr Thr Ser Ser Ser Phe Leu Ser Lys Val Pro Pro Arg 245 250 255 Leu Phe Val Phe Asp Asp Gly Ile Cys Ser Ser Phe Arg Phe Met Thr 260 265 270 Ala Val Glu Ala Arg Tyr Leu Pro Glu Val Arg Gly Tyr Ala Trp Tyr 275 280 285 Asp Glu Ile Tyr Asp Ile Ile Leu Pro Phe Pro Ala Ser Ala Val Val 290 295 300 Arg Ile Val Leu Asp Thr Asp Trp Ala Met Val Ser Asp Glu Thr Leu 305 310 315 320 Pro Ile Lys Leu Thr Thr Leu Leu Pro Thr Leu Ser Asn Val Gly Leu 325 330 335 Leu Arg Gln Val Leu Thr Val Leu Ser Asp Asn Ser Lys Tyr Asn Pro 340 345 350 Val Trp Ala Arg Ala Asn Val Ile Val Met Gly Val Lys Phe Ile Leu 355 360 365 Ala Asn Leu Val Ile Asn Arg Ser Ser Ser Trp Ala Gln Asp Ser Thr 370 375 380 Pro Ser Val Ser Gly Arg Leu Leu Arg Thr Val Pro Gly Lys Pro Glu 385 390 395 400 Tyr Trp Pro Leu Met Tyr Pro Arg Arg Thr Leu Asn Ala Asn Val Ser 405 410 415 Lys Ile Ser Arg Phe Val Glu Gln Thr Gln Ala Glu Arg Thr Gly Arg 420 425 430 Val Asp Arg Ala Met Leu Tyr Gln Gly Glu Lys Val Ile Tyr Thr Asp 435 440 445 Val Ala Glu Thr Cys Asp Thr Leu Thr Val Arg Leu Arg Asp Met Trp 450 455 460 Thr Gly Lys Ile Phe Lys Met His Tyr Thr His Ser Asp Ile Ala Leu 465 470 475 480 Ala Leu Ser Glu Cys Ala Arg Val Val Ser Phe Ser Ala Val Met Ala 485 490 495 Leu Ser Pro Arg Thr Ile Leu Pro Cys Arg Ala Thr Thr Asp Glu Arg 500 505 510 Lys Leu Ala Gln Val Leu Asn Ile Ala Arg Leu Gly Asp Leu Arg Leu 515 520 525 Arg Ile Glu Pro Ile Ile Gln Ser Ala Ala Asp Thr Leu Arg Ser Val 530 535 540 Thr Met Leu Glu Ile Asn Pro Lys Ile Leu Thr Ala Val Leu Asn Arg 545 550 555 560 Ile Cys Glu Asn Gln Thr Gln Ser Val Thr Val Thr Gly Thr Ile Leu 565 570

575 Arg Leu Leu Ser Ser Ala Thr Thr Asp Ser Ser Ala Phe Trp Thr Cys 580 585 590 Ile Ala Ser Trp Leu Tyr Asn Gly Ile Val Thr Thr Thr Leu Arg Gln 595 600 605 Gln Asp Tyr Pro Asn Pro Thr Ala Ser Ile Thr Asp Tyr Thr Ala Leu 610 615 620 Trp Ser Ala Leu Ile Val Ser Leu Val Ser Pro Leu Thr Asn Asp Pro 625 630 635 640 Asn Ala Pro Val Lys Ile Phe Met Thr Met Ala Asn Leu Phe Asn Gly 645 650 655 Tyr Glu Arg Ile Pro Met Asn Asn Ala Ser Met Thr Gln Gly Thr Pro 660 665 670 Pro Trp Ala Phe Asn Asn Pro Asn Lys Trp Pro Ala Cys Phe Ile Gln 675 680 685 Pro Arg Asn Ile Asn Gln Asn Ile Ala Pro Phe Met Arg Ala Trp Ala 690 695 700 Asp Leu Ile His Arg Tyr Trp Pro Gln Pro Gly Val Val Asn Tyr Gly 705 710 715 720 Ser Pro His His Leu Gly Ala Thr Glu Leu Leu Val Glu Asp Gly Gln 725 730 735 Ile Val Thr Pro Leu Pro Val Gln Pro Gln Gln Phe Glu Tyr Ala Ala 740 745 750 Leu Asp Arg Asp Asn Glu Met Ser Thr Trp Ile Asn Gln Val Cys Asn 755 760 765 Phe Phe Ile Arg Cys Ile Asn Gly Thr Asp Leu Arg Thr Ala Ser Asn 770 775 780 Gln Ala Thr Gln Gln Ala Leu Ile Ser Ala Ile Ser Gln Leu Lys Thr 785 790 795 800 Ser Pro Ser Leu Thr Tyr Gly Tyr Met Ser Arg Tyr Leu Pro Tyr Glu 805 810 815 Leu Ala Met Ile Ser Pro Thr Leu Ala Leu Pro Pro Phe Gln Ile Pro 820 825 830 Phe Gln Arg Leu Asn Val Asn Asp Ile Val Tyr Gln Ile Gly Val Arg 835 840 845 Arg His Val Val Arg Asp Gln Val Glu Pro Ala Leu Asp Thr Ser Ser 850 855 860 Thr Leu Glu Thr Ile Gly Gln Leu Ile Glu Ile Asp Ala Gln Ala Leu 865 870 875 880 Leu Val Ser Leu Leu Ser Gly Thr Met Asn Ala Lys Val Leu Pro Ser 885 890 895 Val His Tyr Ala Glu Lys Ile Thr Pro Leu Tyr Met Asp Asp Asp Phe 900 905 910 Phe Ala Pro His Gln Arg Ala Val Val Val Ser Glu Ala Tyr Ser Leu 915 920 925 Val Arg Thr Ile Ile Ser Gln Ile Ser Asp Thr Arg Gly Pro Gln Leu 930 935 940 Asn Pro Leu Ala Trp Ile Pro Ala Pro Asn Ala Ser Ser Pro Val Ser 945 950 955 960 Ala Glu Val Ala Arg Leu Val Asn Asp Met Ile Lys Glu Ala Phe Asp 965 970 975 Met Pro Gly Glu Leu Leu Glu Gly Leu Ile Gly Tyr Gly Asp Pro Arg 980 985 990 Tyr Thr Gln Val Glu Ile Val Ala Gln Arg Cys Arg Ala Ala Pro Leu 995 1000 1005 Arg Phe Glu Pro Leu Ile Pro Pro Ser Val Leu Ala Gln Glu Leu 1010 1015 1020 Gln Leu Val Glu Asn Val Ile Thr Ala Glu Pro Asn Leu Phe Gly 1025 1030 1035 Leu Ala Thr Gly Asp Leu Tyr Leu Glu Arg Ile Asp Thr Ser Ala 1040 1045 1050 Gly Phe Ser Gly Leu Asn Val Ile Gly Trp Glu Gln Trp Asp Ala 1055 1060 1065 Asn Thr Pro Gly Val Ile Val Ala Gly Ser Ser Leu Leu Ile Cys 1070 1075 1080 Ser Gly Phe Asn Gly Val Asp Pro Met Ile Met Asp Ala Asp Gly 1085 1090 1095 Val Glu Arg Pro Ile Thr Gly Arg Trp Val Val Thr Leu Glu Ala 1100 1105 1110 Trp Arg Ser Ser Val Val Thr Val Gln Lys Leu Leu Leu Pro Arg 1115 1120 1125 Ile Arg Ala Gly Lys Leu Ala Val Arg Ile Leu Val Gly Ile Phe 1130 1135 1140 Pro Tyr Thr Ile Asn Tyr Tyr Glu Pro Ala Val Gly Ile Asp Glu 1145 1150 1155 Trp Lys Leu Leu Ser Asp Trp Ala Ser Met Cys Glu Pro Thr Gly 1160 1165 1170 Ile Pro Ala Ile Pro Phe Thr Ala Pro Val Pro Ser Asp Val Ser 1175 1180 1185 Val Val Thr Ala Ala Cys Val Arg Tyr Leu Arg Cys Ser Thr Phe 1190 1195 1200 Asn Glu Gly Ser Leu Met Ala Thr Asn Ala Gly Ser Pro Arg Thr 1205 1210 1215 Val Phe Gly Gln Ser Val Glu Phe Asp Ile Gly Arg Trp Met Gln 1220 1225 1230 Leu Cys Asp Leu Asn Thr Gly Val Asp Glu Ile Gln Leu Pro Asn 1235 1240 1245 Met Ile Glu Phe Tyr Gln Ile Phe Arg Arg Tyr Asn Ile Thr Gln 1250 1255 1260 Thr Glu Leu Thr Gln Val Val Thr Leu Thr Gly Thr Leu Thr His 1265 1270 1275 Pro Val Leu Asn 1280 301290PRTPiscine reovirus 30Met Ala Thr Leu Tyr Gly Leu Arg Ile Thr Arg Leu Lys Asn Leu Pro 1 5 10 15 Leu Leu Glu Arg Asp Thr Glu Glu Tyr Thr Tyr Lys Glu Ile Ile Thr 20 25 30 Phe Leu Thr Thr Asp Val Val Lys Arg Leu Arg Gln Phe Gln Asn Gly 35 40 45 Asp Arg Glu Cys Tyr Ala Val Gln Leu Leu Phe Pro Leu Thr Gly Trp 50 55 60 Cys Pro Ser Val Asp Val Val Asp Gly Thr Ser Tyr Asn Thr Leu Gly 65 70 75 80 Lys Leu Ile Asn Leu Ile Gln Thr Ser Cys Gly Leu Leu Ala Arg Gln 85 90 95 Leu Asn Val Arg Tyr Pro Leu Val Gly Ala Ala Asn Ser Ile Val Asn 100 105 110 Ser Leu Val Ile Thr Gln Leu Val Asp Cys Ala Ile Arg His Glu Ser 115 120 125 Thr Ala Ala Leu Ile Glu His Leu Phe Asp Asp Asn Gly Gln Ile Ser 130 135 140 Ser Leu Thr Val His Ala Thr Thr Trp Asp Glu Val Lys Leu Ser Lys 145 150 155 160 Asn Met Thr Val Arg Arg Arg Val Val Glu Cys Val Ala Gly Leu Lys 165 170 175 Tyr Trp Leu Phe Arg Asn Val Lys Gly Ala Lys Ser Phe Glu Thr Trp 180 185 190 Gly Lys Asp Tyr Pro Gly Tyr Ala Asn Val His Phe Phe Asp Asp Ser 195 200 205 Ala Gly Lys Gln Ala Ala Ile Arg His Ile Gly Asn Asp Val His Ile 210 215 220 Phe Gln His Phe Asp Asn Pro Thr Tyr Ala Pro His Leu Tyr Val Pro 225 230 235 240 Leu Glu Gly Asn Tyr Ser Arg Asp Met Tyr Thr Asp Ser Phe Ser Thr 245 250 255 Leu Val Gln Met Glu Cys Val Val Asp Gln Ala Arg Ala Asn Ser Asn 260 265 270 Ser Gly Leu Lys Met Val Ser Arg Arg Phe Ile Glu Val Met Lys Cys 275 280 285 Ile Gln Arg Pro Met Gly Glu Thr Gly Val Ser Ile Leu Ser Lys Leu 290 295 300 Asp Glu Ile Gly Thr Val Leu Ala Asn Gly Gly Gln Phe Glu Leu Ala 305 310 315 320 Thr Leu Asp Leu Ser Arg Arg Glu Val Ile His Ser Met Ile Asp Thr 325 330 335 Ile Ser Asp Thr Pro Asn Ser Ser Arg Ala Ile Pro Phe Asp Ala Thr 340 345 350 Arg Leu Val Ile Phe Leu Asp Thr Ala Tyr Thr Gly Pro Met Pro Ser 355 360 365 Thr Asp Phe Asn Val Ser Thr Tyr Glu Phe Gly Phe Ser Leu Ile Gly 370 375 380 Ser Val Ser Gly Lys Ala Phe Ser Arg Pro Ile Arg Tyr Ser Pro Asn 385 390 395 400 Tyr Lys Asp Asp Leu Gly Asp Leu His Asp Val Lys Glu Leu Leu Arg 405 410 415 Thr Phe Val Lys Arg Lys Asp Asp Val Thr Ile Ser Asn Ile Trp Asp 420 425 430 Gly Phe Pro Leu Val Asp Phe Ala Lys Phe Gly Asn Ala Ala Thr Thr 435 440 445 Pro Val Asp Pro Arg Leu Arg Lys Glu Phe Pro Asn Asp Tyr Phe Asp 450 455 460 Arg Glu Gln Ser Ile Asn Arg Met Leu Phe Arg Gly Tyr Arg Lys Thr 465 470 475 480 Ile Asp Arg Ser Trp Ala Lys Asp Gln Ala Val Leu Glu Thr Ile Phe 485 490 495 Ser Ile Ala Gly Asn Trp Leu Thr Ala Asn Lys Ser Tyr Thr Ala Ala 500 505 510 Tyr Phe Gly Ala Ser Gly Ile His Pro Asn Asp Asp Gln Pro Leu Val 515 520 525 Ile Asp Pro Trp Ser Lys Gly Thr Ile Phe Gly Val Pro Ala Pro Ser 530 535 540 Ser Lys Val Ser Gln Tyr Gly Tyr Asp Val Ser Asn Gly Val Ile Thr 545 550 555 560 Asp Leu Thr Arg Pro Ser Pro Ser Gly Thr Phe Ser Phe Ile Tyr Cys 565 570 575 Asp Val Asp Gln Val Gln Asp Ala Gly Asp Asp Leu Gly Val Cys Tyr 580 585 590 Gln Ile Val Arg Ser Leu Phe Asp Thr Ile Asn Asp Ala Leu Thr Thr 595 600 605 Gly Gly Ser Phe Val Met Lys Ile Asn Phe Pro Thr Arg Gln Ile Met 610 615 620 Asp Tyr Leu Val Glu Val Val Ala Pro Lys Phe Thr Asp Gly Val Leu 625 630 635 640 Ile Lys Pro Val Val Ser Asn Asn Leu Glu Leu Phe Val Gly Phe Phe 645 650 655 Cys Lys Val Asp Asn Arg Gly Cys His Trp Asn Ser Asp Cys Ser Arg 660 665 670 Phe Met Phe Arg Leu His Asn Arg Tyr Asn His Leu Asp His Ala Cys 675 680 685 Asp Tyr Ile Pro Ile Ile Gly Asn Ala Arg Glu His Pro Arg Ala Ile 690 695 700 Ser Arg Gln Glu Phe Ala Ile Arg Asn Pro Thr Ser Ser Ser Asp Thr 705 710 715 720 Leu Ser Gln Glu Ile Glu Leu Ser Leu Gly Leu Phe Ser Gln Gln Cys 725 730 735 Ala Ala Asn Thr Ile Thr Ile Ser Arg Asn Leu Leu His Gly Met Thr 740 745 750 Glu Ile Leu Val Ser Gly Val Val Thr Ala Ser Ser Leu Asn Arg Cys 755 760 765 Glu Arg Leu Asp Tyr Ser Pro Thr Ile Asp Ser Thr Thr Ile Leu His 770 775 780 Gln His Arg Glu Ile Ala Thr Ala Ser Pro Gln Leu Phe Gln Phe Glu 785 790 795 800 Ala Ser Glu Trp Thr Leu Leu Ala Met Gly Tyr Asn Glu Leu Ala Ala 805 810 815 Arg Phe Val Asn Gly Ser Ala Lys Ser Leu Val Asp Val Gly Ser Gly 820 825 830 Pro Glu Gly Arg Ser Ile Asn Tyr Val Asp Ser Asp Ile Lys Val Thr 835 840 845 Leu Phe Asp Gln Arg Thr Pro His Ile Asn Val Asp Trp Phe Ala Asn 850 855 860 Val Glu Tyr Ile Gln Gly Asp Tyr Leu Gln Arg Arg Asp Trp Arg Gly 865 870 875 880 Cys Thr Phe Asp Thr Ala Ile Cys Ile Phe Ser Phe Gly Ala Ala Thr 885 890 895 Ala Gly Ser Pro Thr Gly Met Ile Glu Tyr Leu Thr Glu Leu Leu Glu 900 905 910 Ile Leu Lys Asp Ala Gly Cys Thr Arg Ile Ile Ile Gln Leu Asn Cys 915 920 925 Pro Leu Met Thr Lys Pro Thr Gly Val Val Ser Lys Leu Glu Ile Asp 930 935 940 Val Ile Asn Asp Asp Tyr Tyr Phe Ile Lys Gln Gly Arg Val Glu Pro 945 950 955 960 Tyr Ala Ser Pro Gln Asp Ile Leu Gly Ala Ile Thr Gln Ala Leu Pro 965 970 975 Gln Ser Thr Val Gln Ile Lys Thr Leu Asp Asp Glu Leu Ser Trp Phe 980 985 990 Pro Arg Ile Ile Ser Glu Gly Phe Arg Val Thr Thr Glu Ala Met Arg 995 1000 1005 Asp Ala Ile Thr Leu Ser Lys Leu Leu Pro Leu Phe Leu Ile Glu 1010 1015 1020 Thr Ser Lys Thr Leu Phe Arg Pro Ala Lys Tyr Ile Gly Leu Val 1025 1030 1035 Asp Glu Val Ile Thr Ala Thr Trp Thr Val Thr Asp Pro Phe Val 1040 1045 1050 Asp Val Ser Val Tyr Leu Glu Asp Thr Ser Val Gly Phe Phe Asn 1055 1060 1065 Thr Ile Asp Asn Glu Ile Ile Gly Val Glu Val Lys Ala Val Phe 1070 1075 1080 Asp Gly Arg Gly Thr Tyr Arg Gly Thr Phe Ser Thr Asp Lys Ala 1085 1090 1095 Gly Val Val Thr Phe Glu Gln Thr Glu Lys Asp Gly Thr Ser Thr 1100 1105 1110 Ile Leu Gly Ser Phe Leu Cys Val Thr Gly Pro Asn Ala Val Ala 1115 1120 1125 Ile Thr Trp Pro Ala Asn Glu Val Val Gly Asp Asn Pro Asn Val 1130 1135 1140 Ala Ser Leu Thr Asn Asn Thr Gly Tyr Glu Leu Ile Val Ala Tyr 1145 1150 1155 Glu Tyr Asp Gly Thr Trp Ile Gly Val Asn Ala Tyr Lys Ala Asn 1160 1165 1170 Val Tyr Glu Asp Ala Ala Gly Asp Asp Lys Met Glu Tyr Tyr His 1175 1180 1185 Val Val Gly Glu Glu Lys Leu Ala Trp Ala Leu Val Asp His His 1190 1195 1200 Tyr Gly Ser Pro Gly Ala Arg Val Val Ile Pro Phe Val Trp Pro 1205 1210 1215 Asp Val Thr Ala Leu Pro Gly Asp Val Leu Val Ala Pro Pro Tyr 1220 1225 1230 Ala Gly Asp Trp Leu Val Asn Val Asp Gly Asn Leu Thr Ala Glu 1235 1240 1245 Leu His Val Asp Glu Pro Asp Glu Ile Pro Ala Leu Trp Thr Leu 1250 1255 1260 Met Thr Arg Ser Val Ala Asn Asn Gly Ser Ser Leu Ser Tyr Ile 1265 1270 1275 Gly Gln Ala Gly Ile Tyr Thr Phe Leu Lys Leu Pro 1280 1285 1290 311286PRTPiscine reovirus 31Met Glu Lys Pro Lys Ala Leu Val Asn Gln Leu Pro Glu Asp Leu Glu 1 5 10 15 Asn Leu Ser Val Ala Leu Ser Gly Thr Ile Glu Leu Thr Ala Asp Ile 20 25 30 Trp Thr Asn Ala Ser Lys Thr Phe Arg Thr Thr Gln Arg His Glu Val 35 40 45 Tyr Asp Ile Ile Asn Lys Ile Glu Phe Ile Asp Ser Phe Leu Val Pro 50 55 60 Ser Ser Leu Phe Gln Pro Pro Pro His Lys Arg Tyr Trp Asp Val Asp 65 70 75 80 Val Arg Gln Arg Val Val Arg Val Pro Lys Cys Ala Val Pro Asp Asp 85 90 95 Val Tyr Leu Pro His Ala Asn Leu Thr Asp Val Leu Glu Ile Asn Thr 100 105 110 Glu Ser Ile His Lys Tyr Gly Gln Leu Arg Lys Glu Ile Gln Ala Ala 115 120 125 Ala Lys Arg Leu Asp Pro Thr Ala Arg Ile Ala Glu Thr Phe Tyr Asn 130 135 140 Leu Ser Val Tyr Gln Ala Asn Gln Ile Lys Phe Pro Leu Glu Arg Phe 145 150 155 160 Leu Leu Cys Leu Val Val Ser Tyr Ala His Glu Leu Ser Pro Ser Pro 165 170 175 Leu Leu Ile Asp Glu Gln Asn Val Asn Phe Leu Thr Ile Glu Ala Asn 180 185 190 Pro Ala Leu Ser Ala Leu Lys Thr Ile Met Leu His Phe Met Glu Tyr 195 200 205 Gly Lys Tyr Lys Pro Pro Phe Leu Lys Thr Ser Arg Asp Ile Val Phe 210 215 220 Ala Leu Tyr Asp Asp Lys Arg Pro Leu Ser Ser Gln Ile Ala Pro Leu 225 230 235 240 Met Ile Asp Leu Val Asn Tyr Ala Ile Val Ile Tyr Ser Cys Asn Ile 245 250 255 Ser Arg Leu Ile Ser Val Pro Thr Val Arg Met Met Leu Lys Ala Ala 260 265

270 Gly Thr Thr Ser Tyr Asn His Thr Gln Leu Lys Leu Lys Lys Ile Ile 275 280 285 Pro Ala Ala Ser Leu Leu Ser Val Tyr His Gly Glu Thr Val Gly Arg 290 295 300 Val Pro Ile Val Val Trp Glu Glu Pro Arg Glu Glu Tyr Arg Phe Arg 305 310 315 320 Leu Asp Gly Ala Arg Asp Leu Pro Arg Gly Trp Lys Asn Glu Leu Gln 325 330 335 Gly Ala Lys Lys Ala Ile Glu Asp Ala Ser Asp Leu Ala Ser Ser Tyr 340 345 350 Gly Met Thr Ala Glu Phe Glu Glu Leu Arg Ser Gln Tyr Ser Lys Ile 355 360 365 Ser Val His Asn Gly Val Gly Met Lys Met Ile Arg Asp Ala Leu Ala 370 375 380 Gly Val Ser Ser Val Phe Ile Thr Arg Thr Pro Thr Asp Thr Val Leu 385 390 395 400 Gln Glu Tyr Val His Ala Pro Val Ile Glu Arg Pro Ile Pro Pro Gln 405 410 415 Asp Trp Thr Asp Pro Val Gly Val Val Lys Tyr Leu Lys Asn Asp Thr 420 425 430 Gln His Tyr Val Ala Arg Asn Leu Tyr Ala Thr Trp Arg Glu Ala Ala 435 440 445 Val Gln Val Ala Asn Asn Pro Asp Asn Trp Asp Pro Asn Thr Gln Ala 450 455 460 Ile Leu Arg Ser Gln Tyr Val Thr Pro Arg Gly Gly Ser Gly Ser Ser 465 470 475 480 Val Lys Lys Val Leu Thr Asp Lys Gly Val Ile Leu Lys Asn Phe Ser 485 490 495 Lys Ser Gly Ala Lys Ser Ser Thr Lys Ile Val Gln Ala Ala Gln Leu 500 505 510 Ala Ser Ile Pro Phe Thr Gln Tyr Gln Asp Thr Ile Met Ala Pro Val 515 520 525 Ser His Gly Val Arg Ile Gln Val Gln Arg Arg Ser Arg Thr Ile Met 530 535 540 Pro Phe Ser Val Pro Gln Gln Gln Val Ser Ala Pro His Thr Leu Cys 545 550 555 560 Gly Asn Tyr Ile Asn Lys Phe Leu Asn Lys Ser Thr Thr Ser Gly Ser 565 570 575 Asn Val Thr Glu Lys Val Ile Pro Leu Gly Ile Phe Ala Ser Ser Pro 580 585 590 Pro Thr Arg Ala Val Asn Ile Asp Ile Lys Ala Cys Asp Ser Ser Ile 595 600 605 Thr Trp Gly Phe Phe Leu Ser Val Ile Cys Gly Ala Met His Glu Gly 610 615 620 Met Asp Gly Ile Asn Val Gly Thr Pro Phe Leu Gly Val Pro Ala Thr 625 630 635 640 Leu Val Glu Asp Gly Leu Asp Leu Gly Ile Val Gly Thr Arg Ser Ile 645 650 655 Ser Gly Met Gln Asn Met Val Gln Lys Leu Ser Gln Leu Tyr Glu Arg 660 665 670 Gly Phe Glu Tyr Glu Val Lys Asp Ala Phe Ser Pro Gly Asn Ala Phe 675 680 685 Thr His His Thr Thr Thr Phe Pro Ser Gly Ser Thr Ala Thr Ser Thr 690 695 700 Glu His Thr Ala Asn Asn Ser Thr Met Met Lys Thr Phe Leu Met His 705 710 715 720 Trp Leu Pro Asn His Thr Lys Asp Leu Glu Leu Ile Asp Phe Val Lys 725 730 735 Lys Leu Asp Val Asn Arg Asn Tyr Val Cys Gln Gly Asp Asp Gly Ile 740 745 750 Met Ile Leu Pro Thr Asn Asp Gly Arg Pro Ile Ser Ser His His Val 755 760 765 Glu Ser Met Leu Glu Leu Leu Ser Val Phe Gly Lys Glu Ser Gly Trp 770 775 780 Val Phe Asp Ile Glu Phe Asn Gly Ser Ala Glu Tyr Leu Lys Leu Leu 785 790 795 800 Phe Leu Asn Gly Cys Arg Ile Pro Asn Val Gly Arg His Pro Val Val 805 810 815 Gly Lys Glu Arg Ala Ser Arg Asp Gln Asp Val Ile Trp Pro Gly Gly 820 825 830 Ile Asp Ala Phe Ile Gly Met Tyr Asn Asn Gly Val Glu Asp Gln Phe 835 840 845 His Trp Arg Arg Trp Leu Lys Phe Ser Trp Ser Met Ala Cys Phe Leu 850 855 860 Ser Ser Lys Ala Val Phe Ile Lys Gly Lys Ser Asp Val Ile Gln Tyr 865 870 875 880 Pro Ser Trp Ser Phe Val Tyr Leu Gly Leu Pro Pro Ile Arg Ile Phe 885 890 895 Asp Ser Pro Pro Trp Ile Phe Ser Pro Tyr Thr Pro Gly Gly Asp Leu 900 905 910 Gly Met Tyr Ser Ile Met Val Thr Gly Lys Lys Tyr Ile Val Asp Arg 915 920 925 Met Gln Ser Ser Gly Tyr Gln Lys Asp Asn Thr Asp Leu Ser Asn Glu 930 935 940 Ser Thr Phe Phe Arg Gly Tyr Asp Tyr Val Lys Phe Met Asn Asp Cys 945 950 955 960 Gly Val Leu Pro Gly Tyr Tyr Met Ser Gln Ile Pro Arg Ser Pro Asp 965 970 975 Lys Thr Lys Arg Lys Val Ile Gly Pro Glu Ser Arg Asp Leu Ile Asp 980 985 990 Ser Leu Arg Asn Tyr Leu Phe Ser Asp Gln Lys Leu Thr Ile Arg Val 995 1000 1005 Asn Tyr Gly His Arg Ile Val Thr Asp Tyr Pro Gly Arg Leu Pro 1010 1015 1020 Arg Lys Leu Pro Ser Leu Asp Asp Val Pro Gln Arg Trp Phe Asp 1025 1030 1035 Thr Ala Val Glu Ala Asp Met Ala Ser Thr Tyr Glu Ile Glu Ala 1040 1045 1050 Met Asp Val His Leu Leu Arg Gly Gln Phe Ser Arg Tyr Gln Ser 1055 1060 1065 Phe Ser Lys Val Leu Glu Ala Tyr Leu Ser Val Asp Trp Glu Leu 1070 1075 1080 Thr Asp Leu Asn Ile Pro Ala Gly Leu Ser Leu Asp Val Pro Leu 1085 1090 1095 Val Ala Gly Cys Asp Pro Thr Asn Gly Glu Pro Tyr Tyr Lys Met 1100 1105 1110 Met Gly Leu Gly Pro Met Met Glu Ser Ile Gln Thr Tyr Phe His 1115 1120 1125 Gly Thr Val Phe Met Ser Arg Ala Val Ser Gly Leu Asp Val Glu 1130 1135 1140 Ser Ile Asp Val Ala Leu Leu Lys Met Lys Ala Leu Lys Val Pro 1145 1150 1155 Thr Glu Val Ile Thr Gly Phe Leu Met Thr Cys Gly Leu Ser Lys 1160 1165 1170 Pro Lys Ala Ser Thr Val Ala Thr Lys Ile Asn Phe Gln Asp Met 1175 1180 1185 Lys Thr Val Gln Val Ala Lys Leu Thr Gly Leu Asn Val Ser Asp 1190 1195 1200 Lys Trp Met Ser Met Asn Phe Asp Arg Leu Leu His Ser Tyr Val 1205 1210 1215 Asp Val Lys Thr Tyr Val Ser Asp Ser Ser Asn Gln Ile Arg Leu 1220 1225 1230 Pro Gly Gly Ala Gly Trp Leu Arg Gly Val Ile Arg Phe Leu Gly 1235 1240 1245 Ala Gly Val Val Met Thr Arg Val Gly Pro Pro Gln Pro Val Arg 1250 1255 1260 Ile Ser Ile Ile Tyr Gly Gly Gly Ala Arg Leu His Ser Lys Phe 1265 1270 1275 Leu Asn Trp Met Val Ser Asp Phe 1280 1285 32687PRTPiscine reovirus 32Met Gly Asn Tyr Gln Thr Ser Asn Asn Gln Phe Trp Val Thr Gly Asp 1 5 10 15 Gly Asn Asp Phe Ser Ala Glu Gly Gly Leu Asp Ser Thr Asn Ala Ala 20 25 30 Ser Leu Asp Phe Lys Ala Gly Lys Thr Asn Pro Gly Gly His Met Tyr 35 40 45 Val Ile Ser Gly Asp Asn Thr Ser Asp Val Val Lys Trp Asp Ser Leu 50 55 60 Thr Pro Leu Tyr Gly Ile Asp Gly Gln Met Val Val Val Leu Thr Ala 65 70 75 80 Val Ala Met Ser Thr Phe Glu Lys Met Val Asn Leu Ile Glu Met Tyr 85 90 95 Arg Pro Leu Leu Glu Ala Ser Gln Gln Met Ala Cys Tyr Arg Asp Trp 100 105 110 Lys Lys Asp Ile Val Leu Leu Asp Gly Tyr Val Gly Ser Thr Pro Gln 115 120 125 Ser Ala Val Thr Asn Phe Val Thr Gly Ala Ser Val Ile Asn Leu Arg 130 135 140 Glu Leu Arg Ser Leu Gly Lys Met Tyr Gln Asn Ile Leu Gly Val Ile 145 150 155 160 Ala Asn Tyr Asp Arg Asp Ile Gln Val Ala Leu Ser Leu Ile Pro His 165 170 175 Ser Thr Pro Ile Gly Ser Leu Thr Ala Asp Met His Ser Ile Leu Arg 180 185 190 Met Phe Ser Leu Ser Leu Lys Pro Thr Asn Val Cys Tyr Leu Tyr Pro 195 200 205 Glu Ala Ala Leu Gln Val Ile Arg Ala Ile Ser Pro Thr Val Arg Asn 210 215 220 Val Asp Thr Gln Gln Gly Gly Ser Ile Val Glu Thr Leu Asn Leu Phe 225 230 235 240 Glu Pro Val Phe Asn Gly Thr Gly Pro Asn Gln Pro Pro Leu Thr Asp 245 250 255 Gln Ser Glu Val Arg Ser Ile Ala Arg Ser Asp Ala Ser Leu Ala Gln 260 265 270 Leu Ser Leu Ile Ser Ser Thr Glu Pro Ile Glu Ala Arg Ala Leu Lys 275 280 285 Ser Gly Thr Pro Thr Lys Thr Tyr Asp Ile Arg Leu Val Asp Pro Leu 290 295 300 Thr Thr Pro Trp Val Ser Lys Ala Tyr Ala Leu Ala Glu Lys Thr Ala 305 310 315 320 Arg Ile Gln Phe Thr Asp Ser Gly Arg Lys Thr Trp Tyr Thr Ala Val 325 330 335 Gly Lys Gly Thr Leu Ala Leu His Leu Asp Asp Ile Thr Ser Met Ser 340 345 350 Ile Thr Met Asp Leu Gly Gly Glu Ser Tyr Tyr Tyr Lys Thr Leu Ala 355 360 365 Asn Asp Ala Ala Glu Thr Val Asp Pro Glu Ser Ala Thr Val Ala Phe 370 375 380 Ile Leu Phe Ser Val Thr Arg Pro Leu Glu Glu Ile Thr Thr Ala Ser 385 390 395 400 Glu Leu Gln Thr Gly Lys Ile Val Ala Phe Glu Lys Leu Met Val Ala 405 410 415 Asn Ser Ser Val Gln Gly Ala Lys Ile Ile Ala Asn Thr Ser Leu Lys 420 425 430 Tyr Asn Phe Asp His Asn Ser Ile Ser Gly Asp Lys Ser Glu Leu Asn 435 440 445 His Tyr Leu Leu Cys Gln Leu Leu Phe Asn Asn Leu Ser Ala Ser Thr 450 455 460 Thr Tyr Thr Gln Gln Asp Ala Trp Ala Gly Lys Thr Thr Met Gln Ser 465 470 475 480 Leu Asp Ser Asp Lys Val Thr Val Lys Gly Val Glu Val Asp Arg Val 485 490 495 Ile Pro Ala Gly Ala Phe Gly Asn Tyr Thr Thr Ala Glu Gln Lys Ser 500 505 510 Ser Leu Pro Asn Asp Leu His Ser Val Met Ala Thr His Leu Glu Arg 515 520 525 Ala Ala Lys Ala Met Thr Ala Ile Asp Asp Glu Asp Gln Glu Gly Gly 530 535 540 Ser Thr Val Ala Asn Ala Ile Phe Gly Ala Leu Ile Ser Lys Glu Ser 545 550 555 560 Pro Val Ala Gly Pro Ile Pro Trp Lys Asn Ile Lys Phe Asp Glu Leu 565 570 575 Arg Val Leu Ser Asp Lys Ala Ala Ser Ser Phe Lys Arg Asp Pro Ser 580 585 590 Gln Ala Leu Ile Ser His Asp Pro Val Leu Gly Asp Ser Ala Val Met 595 600 605 Thr Ser Leu Leu Gly Gly Ile Gly Asn Ala Val Lys Thr Lys Gly Leu 610 615 620 Ser Ala Ala Cys Lys Asp Thr Lys Ser Ala Leu Thr Ala Ala Gln Ser 625 630 635 640 Gly Arg Ser Val Arg Gln Thr Ile Leu Asp Lys Ile Glu Lys Leu Phe 645 650 655 Pro Pro Gly Pro Arg Pro Ala Lys Lys Met Ile Glu Glu Gly Pro Ser 660 665 670 Lys Lys Glu Ala Arg Arg Leu Gly Asp Ser Arg Arg Gly Gln Lys 675 680 685 33760PRTPiscine reovirus 33Met Pro Ile Ile Asn Leu Pro Ile Glu Pro Thr Asp Gln Ser Ile Thr 1 5 10 15 Glu Phe Lys Thr Gln Ala Gln Thr Val Phe Ser Gly Cys Met Glu Asn 20 25 30 Thr Asp Val Thr Phe Val Asp Tyr Leu Lys Arg Asp Val Lys Ile Phe 35 40 45 Ile Val Asp Asn Arg Phe Leu Leu Pro Gln Ile Ala Lys Met Ile Asp 50 55 60 Ser Ser Asp Leu Asp Glu Ile Ala Ser Gln Val Leu Asn Leu Pro Leu 65 70 75 80 Leu Ser Glu Ala Cys Phe Ile Leu Leu Pro Pro Leu Ser Val Met Ala 85 90 95 Lys Arg Leu Leu Ser Ser Ser Asp Ser Tyr Pro Asp Ile Phe Leu Thr 100 105 110 Arg Val Pro Thr Arg Val Leu Lys Ala Gln Ser Asp Asn Ser Arg Ser 115 120 125 Thr Ala Leu Leu Lys Phe Met Pro Lys Val Val Thr Ser Ser Thr Thr 130 135 140 Ala Ser Asp Met Leu Thr Met Ser Val Gln Asn Ala Asp Val Tyr Thr 145 150 155 160 Leu Thr Pro Asp Val Ile Gly Met Pro Leu Arg Arg Tyr Ala Glu Lys 165 170 175 Ser His Tyr Pro Ser Ala Phe Asp Phe Gly Ser Ala His Pro Ser Asn 180 185 190 Trp Arg Arg Ser Val Ile Lys Ala Ser Asn Ser Leu Leu Ile Pro Met 195 200 205 Val Pro Val Met Ser Thr Ala Lys Thr Leu Tyr Leu Asp Ala Asp Phe 210 215 220 Ser Thr Ser Asp Asp Arg Thr Gly Ile Phe Trp Arg Leu Ser Ala Ser 225 230 235 240 Ala Arg Ile Arg Ala Arg Gln Arg Gly Val Ile Val Leu Pro Ser Met 245 250 255 Ile Lys Thr Phe Tyr Glu Lys Glu Arg Gly Leu Lys Ser Ala Pro Val 260 265 270 Gln Leu Arg Arg Glu His Lys Met Ala Ala Arg Leu Leu Arg Ile Pro 275 280 285 Phe Gly Arg Val Pro Ser Glu Thr Ser Phe Arg Arg Asp Met Val Gln 290 295 300 Cys Cys Asp Leu Leu Val Ser Thr Ser Val Leu Asn Lys Leu Leu Ser 305 310 315 320 Pro Thr Glu Ala Gly Lys Ser Pro Pro Phe Asp Lys Tyr Val Phe His 325 330 335 Gly Val Pro Val Glu Phe Ile Asn Arg Val Cys Pro Asp Ile Gly Thr 340 345 350 Gln Ala Leu Gly Arg Asp Thr Asn Gly Tyr Leu Gln Glu Trp Leu Ile 355 360 365 Met Leu Phe Leu Met Ser Asp Tyr Ile Thr Ser Thr Thr Ser Arg Arg 370 375 380 Arg Leu Thr Leu Val Thr Asn Phe Asp Pro Met Arg Lys Trp Tyr Asp 385 390 395 400 Ile Thr Leu Leu Lys Ile Thr Asn Thr Tyr Tyr Gln Cys Gln Glu Met 405 410 415 Met Thr Pro Pro Ala Ile Ser Ser Phe Gly Val Cys Ser Gln Lys Gly 420 425 430 Thr Phe Lys Ser Thr Leu Ser Ser Trp Leu Ser Gln Val Ile Val Arg 435 440 445 Gly Val Asn Leu Phe Pro Glu Gly Ser Ile Val Asp Ser Asp Asp Leu 450 455 460 Gly Ser Lys Leu Asp Pro Thr Phe Glu Ser Glu Trp Glu Thr Asn Val 465 470 475 480 Ile Glu Lys Ile Gly Met Pro Val Ile Ile Arg Gly Leu Thr Glu Glu 485 490 495 Gly Ala Phe Lys Ile Thr Thr Asp Thr Met Phe Asp Thr Tyr Ala Leu 500 505 510 Phe Arg Gln Leu Tyr Asp Arg Met Ile Val Pro Val Ala Arg His Phe 515 520 525 Phe Asp Tyr Ser Val Ala Ser Gly Arg Lys Met Ile Phe Ala His Cys 530 535 540 Asp Ser Glu Phe Leu Asp Asn Ser Phe Pro Ser Pro Phe Tyr Arg Thr 545 550 555 560 His Ile Thr Ile Asp Asn Tyr Gly Asn Ile Leu Asn Arg Pro Asn Arg 565 570 575 Val Gly Gly Val Leu Ser Gln Tyr Val

Leu Ala Glu Cys Tyr Arg Leu 580 585 590 Met Ala Thr Ser Cys Lys Ser Arg Pro Ile Ala Lys Leu Leu Lys Ala 595 600 605 Lys Leu Val Pro Trp Trp Glu Phe Asp Ser His Val Lys Arg Met Gly 610 615 620 Gly Thr Pro Val His Tyr Ser Leu Gly Val Lys Ile Gln Pro Glu Leu 625 630 635 640 Met Arg Asp Ala Gly Tyr Cys Gly His Leu Ile Asp His Ala Arg Val 645 650 655 Glu Val Leu Gln Ala Met Trp Val Pro Glu Ala Val Asp Glu Ser Phe 660 665 670 Phe His Asn Pro Pro Ser Met Pro Leu Thr Ile His Leu Ala Asp Ser 675 680 685 Lys Tyr Asn Arg Tyr Glu Pro Ile Gly Glu His Asn Leu Asn Ile Pro 690 695 700 Val Leu Ile Asp Thr Ser Thr Ser Tyr Leu Ser Glu Thr Tyr Leu Pro 705 710 715 720 Ala Gly Val Val Phe Thr Pro Thr Lys Arg Phe Thr Val Glu Gly Cys 725 730 735 Asp Phe Asn Cys Trp Arg Gly Asn Pro Ile Thr Phe Lys Gly Thr Leu 740 745 750 Ser Trp Trp Ser Thr Ala Gly Glu 755 760 34752PRTPiscine reovirus 34Met Ala Glu Ser Ile Thr Phe Gly Gly Pro Ser Arg Lys Leu Asp Leu 1 5 10 15 Val Ala Ser Gly Ser Lys Pro Ile Thr Val Thr Val Thr Val Gly Asp 20 25 30 Leu Gly Cys Ser Ile Tyr Gly Thr Val Pro Arg Gly Thr Asp Glu Phe 35 40 45 Val Thr Ser Asp Arg Tyr Leu Ala Met Cys Arg His Leu Leu Val Phe 50 55 60 Lys Pro Thr Leu Asn Asn Gly Thr Leu Thr His Tyr Thr Ala Phe Ser 65 70 75 80 Ala Ile Arg Ser Met Ile Ser Pro Leu Gly Phe Gly Val Met Arg Asn 85 90 95 Val Asp Val Val Glu Lys Gln Cys Ala Ile Ile Glu Ala Leu Glu Arg 100 105 110 Arg Gly Met Leu Asn Glu Val Lys Asp Ala Ala Ala Glu Leu Pro Leu 115 120 125 Gln Leu Asp Val Thr Asp Thr Ser Thr His Val Asp Pro Ala Ile Ile 130 135 140 Asp Ser Leu Pro Pro Leu Ile Gln Asn Glu Val Ala Ala Gly Leu Thr 145 150 155 160 Pro Leu Glu Leu Pro Ala Ile Thr Met Val Gln Thr Ala Pro Leu Ile 165 170 175 Thr Pro Ala Leu Gly Met Glu Asn Asp Asp Phe Asn Leu Ser Arg Tyr 180 185 190 Phe Phe Ala Ser Gly Phe Ile Asp Gln Ala Ser Arg Ile Gly Gly Thr 195 200 205 Val Asn Asp Glu Tyr Val Lys Gly Phe Met Gln Ala Leu Pro Arg Phe 210 215 220 Asn Asp Asp Gly Ser Ile Arg Val Asp Cys Asp Val Leu Thr Cys Leu 225 230 235 240 Cys Ser Arg Asp Glu Asp Leu Ser Val Leu Thr Pro Leu Ser Val Asn 245 250 255 Thr Thr Ala Val Ser Asp Met Phe Glu Leu Ser His Asp His Gln Pro 260 265 270 Met Ala Tyr Leu Arg Thr Val Tyr Val Glu Asp Tyr Ile Ala Ser His 275 280 285 Leu Glu Ser Leu Lys Asn Arg Glu Thr Ala Thr Pro Leu Val Leu Lys 290 295 300 Leu Ser Ala Val Asn Ser Val Thr Pro Lys Ala Leu Ile Ala Leu Val 305 310 315 320 Glu Ser Lys Ala Thr Asp Ser Ile Phe Asn Gln Ala Asp Lys Arg Trp 325 330 335 Met Ile Gly Leu Asp Pro Met Phe Ser Glu Cys Trp Pro Gly Ala Ile 340 345 350 Ala Leu Leu Ser Met Leu Phe Asp His Lys Val Asp Tyr Trp Ser Val 355 360 365 Arg Cys Arg Phe Ile Leu Arg Ser Ala Leu Ile Gly Met Ser Asp Asp 370 375 380 Asp Ala Arg Pro Arg Val Gln Met Met Arg Met His Tyr Ser Leu Thr 385 390 395 400 Thr Pro Thr Thr Trp Tyr Ser Thr Arg Gly Val Tyr Ser Ala Glu Gly 405 410 415 Arg Ser Lys Ile His Tyr Ala Ser Gly Asp Arg Met Arg Leu Gly Leu 420 425 430 Arg Val Gly Glu Val Arg Asp Arg Gln Val Thr Met Leu Glu Asp Leu 435 440 445 Ser Thr Ile His Ser Met Asp Val Ala Asn Met Lys Asp Gln Val Ile 450 455 460 Gln Lys Asp Val Gln Leu Lys Ala Leu Thr Glu Ala Met Ser Gln Lys 465 470 475 480 Asp Ser Leu Ile Asp Ser Leu Arg Ala Asp Val Ala Gly Leu Thr Glu 485 490 495 Arg Ala Val Leu Val Gln Ala Glu His Leu Thr Thr Ile Ala Asp Met 500 505 510 Glu Val Arg Arg Val Gln Ser Glu Asp Lys Ala Arg Ile Gly Ile Asp 515 520 525 Ala Ala Asn Arg Arg Ala Gly Glu Ala Ile Glu Ser Ala His Leu Leu 530 535 540 Thr Glu Glu Phe Ser Lys Cys Leu Ser Ser Asp Phe Leu Met Val Lys 545 550 555 560 Pro Leu Pro Glu His Asn Gln Cys Pro Val Pro Leu Leu Glu Ser Val 565 570 575 Trp Pro Ala Leu Cys Gln Arg Tyr Ile Gln Asn Met Gln Leu Val Asp 580 585 590 Glu Ile Trp Thr Asn Lys Leu Ala Asp Ala Thr Asp Thr Ile Ala Thr 595 600 605 Glu Met Ala Glu Glu Thr Met Arg Ile Ile Ala Glu Arg Asp Cys Gln 610 615 620 Ala Met Val Met Pro Val Val Glu Ala Pro Lys Pro Gln Arg Lys Pro 625 630 635 640 Arg Ile Tyr Glu Pro Ser Asp Asp Asp Leu Glu Arg Thr Ser Val Ser 645 650 655 Ser Thr Ser Ser Glu Lys Lys Lys Arg Val Ile Trp Ser Arg Ser Ala 660 665 670 Thr Arg Val Pro Arg Thr Asp Val Asp Phe Ser Ala Ile Thr Ala Ala 675 680 685 Arg Arg Asp Glu His Phe Glu Leu Gly Met Pro Arg Glu Gly Arg Tyr 690 695 700 Pro Val His Ser Gly Ile Pro Gly Ser Val Arg Ala Thr Met Thr Arg 705 710 715 720 Gly Leu Ala Ile Asp Ser Met Ser Glu Phe Pro Lys Ile Ile Asp Phe 725 730 735 Gly Gly Ser Asp Asp Trp Asp Val Gly Val Asn Asn Val Leu Arg Gly 740 745 750 35420PRTPiscine reovirus 35Met Ala Arg Ala Ile Phe Ser Gly Ile Ser Ala Phe Phe Ala Asn Ala 1 5 10 15 Pro Tyr Val Gln Asp Gly Asp Thr Ile Lys His Ala Phe Leu Ser Gly 20 25 30 Asp Ser Leu Phe Phe Gln Gly Thr Asn Thr Leu Tyr Pro Thr Leu Ser 35 40 45 Thr Ser Tyr Gln Gly Asp Thr Asp Leu Pro Thr Pro Phe Thr Val Met 50 55 60 Tyr Gln Thr Ala Met Val Arg Ser Ala Leu Phe Gln Val Pro Leu Phe 65 70 75 80 Gly Gly Leu Trp Asn Ala Arg Ser Tyr Arg Asp Leu Val Phe Thr Ser 85 90 95 Gln Ala Met Leu Asn Val Lys Thr Asn Thr Ser Val Thr Cys Pro Pro 100 105 110 Pro Val Ile Pro Arg Pro Ala Tyr Val Tyr Asn Val Met Asn Asn Gln 115 120 125 Arg Phe Ala Gln Ser Ala Thr Ala Arg Asn Lys Val Tyr Val Asp Phe 130 135 140 Ser Ile Thr Thr Leu Phe Gln Met Asp Ile Asn Gly Phe Ala Leu Pro 145 150 155 160 Leu Leu Phe Asn Pro Asp Asp Asn Gly Ile Asp Val Thr Leu Ala Leu 165 170 175 Thr Ser Leu Val Gly Gln Ser Trp Ser Thr Ile Val Gly Ala Arg Tyr 180 185 190 Glu Ser Ala Gly Asn Ala Ala Met Asp Ile Asp Asn Pro Ile His Arg 195 200 205 Thr Asn Arg Ala Leu Met Leu Leu Tyr Leu Gly Ser Ala Cys Gly Tyr 210 215 220 Phe Asn Pro Thr Met Thr Trp Asn Gly Phe Tyr Phe Arg Gln Ala Gly 225 230 235 240 Lys Pro Gly Ser Trp Gly Ala Asp Leu Asp Pro Ile Leu Val Arg Gly 245 250 255 Asp Ser Ala Leu Ile Asn Arg Ala Thr Phe Val Arg Leu Asn Arg Trp 260 265 270 Val Val Phe Lys Asp Phe Leu Trp Gln Met Ser Arg Gly Thr Leu His 275 280 285 Ala Leu Val Leu Gly Gly Met Ile Cys Ala Val Glu Gln Pro Leu Arg 290 295 300 Gly Leu Ser Val Ile Ser Val Leu Ala Asn Thr Val Cys Ala Pro Trp 305 310 315 320 Thr Gly Val Asn Gly Arg Ala Gly Asp Glu Val Thr Thr Ile Gly Leu 325 330 335 Lys Tyr Val Ala Ile Glu Asn Leu Ile Arg Ser Gly Ser Tyr Thr Val 340 345 350 Ala Glu Gly Val Val Ala Asp Ala Gln Ile Ala Ala Trp Gly Val Arg 355 360 365 Asn Thr Asp His Met Asp Arg Val Arg Ala Ala Asp Asp Ala Asn Val 370 375 380 Leu Ala Gly Val Asn Ile Arg Arg Val Lys Pro Trp Asp Asn Gly Gly 385 390 395 400 Gly Phe Gln Arg Leu Ala Ala Val Arg Ala Leu Val Asn Leu Met Ala 405 410 415 Ala Asn Thr Arg 420 3671PRTPiscine reovirus 36Met Ala Thr Gln Leu Ser Met His Ser Phe Leu Ala Thr His Ser Phe 1 5 10 15 Ser Lys Gly Pro Thr His Cys Thr Pro His Phe Pro Gln Val Ile Lys 20 25 30 Glu Ile Leu Thr Ser Gln Pro His Leu Leu Leu Cys Ile Arg Leu Leu 35 40 45 Trp Ser Gly Leu Arg Tyr Phe Arg Tyr His Ser Ser Ala Asp Phe Gly 50 55 60 Thr Gln Glu Ala Ile Gly Ile 65 70 37354PRTPiscine reovirus 37Met Ser Asn Phe Asp Leu Gly Arg Gln Ala Asn Lys Pro Lys Thr Glu 1 5 10 15 Tyr His Leu Asn Ala Leu Pro Tyr Leu Lys Cys Gly Ile Lys Asn Ser 20 25 30 Glu Ser Val Gly Ser Val Ile Ile Asn Phe Pro Ala Arg Phe Asp Thr 35 40 45 Ala Lys Ser Val Ser Pro Leu Ser Ala Met Thr Asn Asp Gly Phe Leu 50 55 60 Lys Phe Lys Asp Pro Ser Asp Ser Leu Ala Ser Arg Asp Arg Pro Ala 65 70 75 80 Phe Asn Asp Tyr Val Arg Ala Leu Gln Pro Ser Pro Glu His Pro His 85 90 95 His Phe Gln Ala Leu Asp Pro Ala Phe Thr Asp Glu Ile Leu Lys Thr 100 105 110 Cys Asp Pro Thr Phe Asn Trp Thr Ser Ile Lys Ser Gly Asp Lys Tyr 115 120 125 Tyr Leu Pro Ala Ile Ser Gln Ala Leu Val Tyr Arg Ala Ser Gly Phe 130 135 140 Arg Phe Asn Ser Glu Lys His Leu Glu Gln Thr Gly Ser Leu Leu Pro 145 150 155 160 Ile Ala Leu Gly Ile Ser Lys Ala Thr Cys Ala Leu Pro Val Leu Val 165 170 175 Asp Ser Gly Thr Val Val Cys Pro Glu Glu Asn Val Ser Ala Leu Phe 180 185 190 Ser Lys Asp Lys Leu Ser Ser Leu Asp Ile Gln Phe Gly Tyr Pro Lys 195 200 205 Pro Lys Asn Gly Asn Asp Ser Thr Ala Tyr Thr Lys Ser Ile Asn Gly 210 215 220 Tyr Gln Ile Gly Ala Tyr Gly Leu Lys Leu Pro Gly Gly His Phe Leu 225 230 235 240 Lys Leu Ile His Ile Leu Asn Cys Met Cys Leu Lys Ala Asp Leu Asp 245 250 255 Leu Leu Ser Gln Val Pro Ser Leu Ala Asp Ser Leu Asn Arg Gly Met 260 265 270 Arg Cys Gly Tyr Ala Leu Leu Gln Tyr Val Ser Gln Phe Ala Thr Val 275 280 285 Asp Arg Glu Leu Leu Leu Met Ser Phe Leu Leu Lys Glu Ala Asn Asp 290 295 300 Pro Thr Phe His Glu Val Ala Ala Met Trp Lys Ser Val Arg Asp Gly 305 310 315 320 Thr Ala Gln Met Asp Asp Val Arg Phe Asp Leu Gln Pro Phe Gly Ile 325 330 335 Met Ala Ser Thr Ala Ser Leu Arg Asp Gly Val Arg Ile Met Ala Met 340 345 350 Phe Cys 38315PRTPiscine reovirus 38Met His Arg Phe Thr Gln Glu Asp His Val Ile Ile Asn Ser Arg Leu 1 5 10 15 Asp Ala Ile Glu Glu Asp Asn Lys Arg Asn Phe Ala Ser Leu Lys Gln 20 25 30 Ser Ile His Asn Asn Tyr Gly Leu Leu Arg Ser Leu Leu Gly Gly Gln 35 40 45 Gly Arg Leu Asn Gly Lys Ile Gly Asp Leu Glu Lys Asp Val Asn Leu 50 55 60 Ile His Leu Arg Val Val Ser Leu Glu His Ala Leu Asp Asp Leu Arg 65 70 75 80 Ala Asp Phe Asp Ala Phe Thr Pro Thr Val Gly Pro Glu Ile Asp Asp 85 90 95 Lys Leu Ala Pro Leu Gln Lys Gln Leu Lys Val Leu Asn Asp Gln Leu 100 105 110 Thr Ile Met Asn Ser Glu Val Ala Val Leu Gly Lys Gly Ile Phe Gly 115 120 125 Asp Tyr Gln Leu Thr Asp Leu Leu Gly His Thr Val Gly Gly Val Ala 130 135 140 Ala Val Thr Thr Asn Ser Leu Thr Ser Ala Phe Arg Leu Ser Asp Arg 145 150 155 160 Leu Pro Ala Thr Thr Val Gly Asp Phe Ser Leu Ser Thr Gly Val Gly 165 170 175 Tyr Thr Phe Val Gly Thr Ala Pro Arg Pro Ile Leu Gln Val Glu Asp 180 185 190 Phe Met Arg Gly Thr Cys Arg Met Asn Leu Thr Asp Thr Ala Leu Met 195 200 205 Tyr Gly Gly Ser His Ile Pro Leu Leu Gln Gln Ser Leu Leu Gln Leu 210 215 220 Glu Thr Thr Val Pro Pro Gly Pro Thr Asp Trp Lys Lys Leu Pro Gln 225 230 235 240 Met Val Lys Gly Val Leu Trp Met Ser Leu Val Asp Tyr Glu Gly Ala 245 250 255 Asn Val Val Pro Val Val Val Met Arg Lys Val Asn Ala Thr Val Thr 260 265 270 Thr Val Ile Leu Pro Asp Met Val Gly Lys Gln Lys Leu Ile Ser Ser 275 280 285 Phe Pro Trp Thr Thr Arg Ser Thr Phe Met Ser Pro Gly Met Glu Val 290 295 300 Ile Ile His Gly Gly Asp Phe Val Ile Ile Ile 305 310 315 39330PRTPiscine reovirus 39Met Ala Asn His Arg Thr Ala Thr Thr Thr Asp Phe Ser Asp Phe Ile 1 5 10 15 Glu Ser Thr Leu His Gly Asn Ile Ile Phe Tyr Asp Asp Gln His Asn 20 25 30 Thr Ser Ser Glu Trp Ile Pro Gly Thr Ser Lys Phe Val Arg Val Gly 35 40 45 Ser Leu Arg Ile Cys Val Glu Cys Gly His Arg Val Gly Leu Ser His 50 55 60 Asn Ala Lys Pro Val Met Val Thr His Gln Cys Asp Gly Asp Thr Leu 65 70 75 80 Trp Asp His Ser Thr Pro Gly Asp Trp Thr Trp Ser Glu Trp Ser Tyr 85 90 95 Phe Val Thr Ser Cys Ala Asn Ala Leu Ser Ala Asn Ala Asp Ala Tyr 100 105 110 Leu Arg Ile Leu Asn Asp Lys Trp Thr Glu Asp Asn Ser Arg Gly Ser 115 120 125 Asn Asp Arg Pro Asp Arg Arg Gly Val Ile Glu Ala Lys Arg Arg Leu 130 135 140 Arg Asp Asp Met Arg Gly Ile Met Lys Lys Lys Thr Ala Gly Asp Leu 145 150 155 160 Gly Leu Thr Gly Trp Leu Ile Leu Asp Pro Asp Glu Leu Glu Ser Phe 165 170 175 Pro Asp Tyr Ser Thr Glu Met Thr Gln Leu Gln Glu Asp Met Glu Glu 180 185 190 Leu Asn

Pro Val Glu Gln Lys Thr Gly Asn Gly Gly Lys Ala His Val 195 200 205 Ala Ala Ala Asn Gln Phe Pro His Lys Val Ile Leu Arg Pro Ala Tyr 210 215 220 Gly Thr Val Pro Ile Val Met Tyr Leu Asp Thr Arg Glu Asp His Asn 225 230 235 240 Ala Tyr Leu Cys Leu Ser Leu Lys Thr Lys Ala His Met Val Asn Met 245 250 255 Ile Arg Arg Met Cys Tyr Ser Gly Met Pro Ala Asn Ile Ile Lys Met 260 265 270 Thr Gln Gly Met Ala Leu Ser Gly Met Glu Glu Met Thr Phe Arg Ser 275 280 285 Gly His Arg Leu Phe Gly His Met His Ser Gly His Thr Ile Pro Val 290 295 300 Lys Gly Thr Ser Ser Leu Thr Leu Thr Ser Gly Lys Cys Ser His Thr 305 310 315 320 Cys Gln Asn Leu Leu Lys Trp Ser Ser Ala 325 330 40124PRTPiscine reovirus 40Met Thr Thr Asn Ile Thr Leu Gln Ala Ser Gly Ser Leu Val Pro Ala 1 5 10 15 Ser Leu Leu Gly Ser Val Pro Phe Glu Tyr Val Leu Asn Ala Gly Ile 20 25 30 Gly Leu Val Cys Leu Ile Met Leu Ser Leu Leu Trp Ser Leu Ile Asn 35 40 45 Ala Thr Ala Ile Arg Cys Gly Ile Ile Leu His Pro Glu Ile Gly His 50 55 60 Gly Val Asn Gly Ala Ile Ser Ser Leu Val Ala Gln Met Pro Phe Leu 65 70 75 80 Arg Thr Gln Thr Leu Thr Ser Glu Ser Ser Met Thr Asn Gly Gln Lys 85 90 95 Thr Thr Val Ala Val Gln Thr Thr Asp Gln Thr Asp Ala Glu Ser Leu 100 105 110 Lys Leu Ser Asp Ala Leu Glu Thr Ile Cys Val Ala 115 120 4124DNAArtificial SequenceDescription of Artificial Sequence Synthetic probe 41catactccaa gatcatcgcc agca 24426PRTArtificial SequenceDescription of Artificial Sequence Synthetic 6xHis tag 42His His His His His His1 5 4311DNAArtificial SequenceDescription of Artificial Sequence Synthetic oligonucleotide 43cccttaaggg c 114415DNAArtificial SequenceDescription of Artificial Sequence Synthetic oligonucleotide 44gcccttggtg aaggg 15

Claims

1.-6. (canceled)

7. A Piscine Reovirus (PRV) immunogenic composition comprising a recombinant PRV polypeptide.

8. The immunogenic composition of claim 7, wherein the recombinant PRV polypeptide is a polypeptide encoded by a cDNA with the sequence of any of SEQ ID NOs: 1-10.

9. (canceled)

10. The immunogenic composition of claim 7, wherein the recombinant PRV polypeptide is a polypeptide encoded by a cDNA that has a nucleic acid sequence substantially identical to the nucleic acid sequence of any of SEQ ID NOs: 1-10.

11. (canceled)

12. The PRV polypeptide of claim 7, wherein the recombinant PRV polypeptide is a polypeptide encoded by a cDNA having a nucleic acid sequence that is at least about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to a nucleic acid sequence of any one of SEQ ID NOs: 1-10.

13. The immunogenic composition of claim 7, wherein the recombinant PRV polypeptide is a polypeptide comprising the amino acid sequence of SEQ ID NOs: 29-40.

14. (canceled)

15. The immunogenic composition of claim 7, wherein the recombinant PRV polypeptide is substantially identical to the amino acid sequence of any of SEQ ID NOs: 29-40.

16. (canceled)

17. The recombinant PRV polypeptide of claim 7, wherein the PRV polypeptide has at least about 95.5%, about 96%, about 96.5%, about 97%, about 97.5%, about 98%, about 98.5%, about 99%, about 99.5% or about 99.9% identity to that of any one of SEQ ID NOs: 29-40.

18-24. (canceled)

25. An immunogenic composition comprising a killed virus comprising a Piscine Reovirus (PRV) polypeptide.

26. An immunogenic composition comprising an attenuated virus comprising a Piscine Reovirus (PRV) polypeptide.

27. The immunogenic composition of claim 7 further comprising at least one excipient, additive or adjuvant.

28. The immunogenic composition of claim 7 further comprising at least one polypeptide, or fragment thereof, from an additional piscine pathogen.

29. (canceled)

30. The immunogenic composition of claim 28, wherein the additional piscine pathogen is selected from the group consisting of Sleeping disease virus (SDV); salmon pancreas disease virus (SPDV); infectious salmon anemia (ISAV); Viral hemorrhagic septicemia virus (VHSV); infectious hematopoietic necrosis virus (IHNV); infectious pancreatic necrosis virus (IPNV); spring viremia of carp (SVC); channel catfish virus (CCV); Aeromonas salmonicida; Renibacterium salmoninarum; Moritella viscosis, Yersiniosis; Pasteurellosis; Vibro anguillarum; Vibrio logei; Vibrio ordalii; Vibrio salmonicida; Edwardsiella ictaluri; Edwardsiella tarda; Cytophaga columnari; or Piscirickettsia salmonis.

31. A method of inducing an immune response in an animal, the method comprising administering the PRV immunogenic composition of claim 7.

32. A method for preventing, or reducing PRV infection in an animal, the method comprising administering to the animal the PRV immunogenic composition of claim 7.

33. (canceled)

34. The method of claim 32, wherein the administration is oral administration, immersion administration or injection administration.

35.-36. (canceled)

37. A method for preventing, or reducing PRV infection in an animal, the method comprising administering to the animal the isolated PRV immunogenic composition of claim 25.

38. A method for preventing, or reducing PRV infection in an animal, the method comprising administering to the animal the PRV immunogenic composition of claim 26.

Images