Affiliation:
1. Washington Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Washington State University, Pullman, WA, USA
2. Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA, USA
Abstract
We performed a diagnostic disease investigation on a cohort of coho salmon ( Oncorhynchus kisutch) fingerlings in Alaska exhibiting anorexia, gaping mouths, anemia, and increased mortality. Histologic examination revealed mild-to-severe myocardial degeneration and lymphohistiocytic and neutrophilic myocarditis, moderate splenic histiocytosis, and mild renal histiocytosis. Piscine orthoreoviruses 1 and 3 were not detected by molecular methods, and no other viruses could be cultured on 3 common diagnostic fish cell lines. De novo assembly produced a viral genome of 10 linear segments with >80% homology to piscine orthoreovirus 2 (PRV2) encoding all 11 PRV2 proteins. An in situ hybridization probe using RNAscope was developed against 697 viral nucleotides identified by sequencing, which revealed viral genome in heart, spleen, gill, kidney, liver, blood, and the lamina propria of the intestines. Our findings are supportive of a novel piscine orthoreovirus most closely related to PRV2 associated with morbidity and mortality of coho salmon in the northeastern Pacific.
Funder
U.S. Department of Agriculture–National Animal Health Laboratory Network
Cited by
1 articles.
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1. Special section on aquatic animal health and disease;Journal of Veterinary Diagnostic Investigation;2024-04-14