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| Infectious salmon anaemia virus | |
|---|---|
| Name | Infectious salmon anaemia virus |
| Virus group | Orthomyxoviridae |
| Genus | Isavirus |
| Species | Infectious salmon anaemia virus |
Infectious salmon anaemia virus is an aquatic orthomyxovirus causing a systemic disease of Atlantic salmon, with major impacts on aquaculture, fisheries, and conservation. First described in the 1980s, outbreaks have invoked responses from regulatory bodies, trade organizations, and research institutes across multiple nations. Control measures have involved veterinary authorities, international trade agreements, and regional biosecurity programs.
Infectious salmon anaemia virus belongs to the family Orthomyxoviridae and the genus Isavirus, with a segmented negative-sense RNA genome and structural proteins for membrane fusion and nucleocapsid assembly; taxonomy discussions have engaged specialists from International Committee on Taxonomy of Viruses, University of Bergen, and Veterinary Laboratories Agency. The virion architecture, replication cycle, and reassortment potential have been compared against paradigms established by Influenza A virus, Influenza B virus, and Thogotovirus in molecular studies led by teams at National Institutes of Health, Norwegian Institute of Marine Research, and Genome Canada. Genetic diversity is defined by multiple genogroups and hemagglutinin-esterase analogues studied using sequencing platforms from Illumina, Pacific Biosciences, and Oxford Nanopore Technologies, with phylogenetics employing methods used at Max Planck Institute for Evolutionary Anthropology and Sanger Institute. Viral entry, budding, and host range determinants have been examined in cell culture models established at University of Glasgow, University of Stirling, and Dalhousie University.
Primary susceptible species include Atlantic salmon farmed in regions associated with agencies like Fisheries and Oceans Canada, Marine Scotland Science, and Norwegian Directorate of Fisheries, while potential reservoirs and incidental hosts have involved species monitored by Irish Sea Fisheries Board, Icelandic Food and Veterinary Authority, and Maine Department of Marine Resources. Transmission pathways encompass horizontal spread via seawater, equipment, and vectors scrutinized by researchers at Institute of Marine Research, Scottish Aquaculture Innovation Centre, and AquaTT; anthropogenic movement of stocks and broodstock has implicated stakeholders including Marine Harvest (now Mowi), Grieg Seafood, and Cooke Aquaculture. Wild fish migration patterns studied by North Atlantic Salmon Conservation Organization and tagging programs run by Tagging of Pacific Salmon initiatives intersect with farmed-sourced transmission risk assessments conducted with collaborators from World Organisation for Animal Health and Food and Agriculture Organization. Environmental factors such as water temperature shifts analyzed by Met Office, Norwegian Meteorological Institute, and Environment and Climate Change Canada influence viral persistence and spread.
Affected salmon present with anemia, exophthalmia, ascites, and hemorrhagic gills observed in diagnostic reports submitted to Veterinary Laboratories Agency, Canadian Food Inspection Agency, and Marine Scotland Science, while gross pathology has mirrored descriptions in case series from University of Stirling and University of Bergen. Histopathologic lesions in kidney, liver, and heart have been reported in studies published by teams at University of Oslo, Queen's University Belfast, and University of New Brunswick; immune responses characterized by lymphoid depletion and inflammatory infiltrates have been investigated using methods from Wellcome Trust-funded laboratories and European Molecular Biology Laboratory. Co-infections with agents monitored by Scottish Fish Health Inspectorate and Atlantic Veterinary College complicate clinical outcomes and are considered in differential diagnoses used by Veterinary Diagnostic Laboratories.
Diagnostic approaches include immunohistochemistry, virus isolation in cell lines developed at Centre for Environment, Fisheries and Aquaculture Science, and molecular assays such as RT-PCR protocols standardized by World Organisation for Animal Health and adapted by CFIA Laboratories; sequencing for genotyping has been implemented using pipelines from European Nucleotide Archive collaborators. Serological assays and ELISAs used by surveillance programs at Norwegian Veterinary Institute, Irish Department of Agriculture, and Icelandic Food and Veterinary Authority aid in retrospective exposure assessment. Bioassay and challenge studies conducted under regulatory oversight from Animal Welfare Act frameworks and institutional review boards at University of Glasgow inform pathogenicity evaluations. Laboratory biosafety practices align with standards from World Health Organization and national biosafety committees.
Notable outbreaks occurred in the 1990s and 2000s in regions regulated by Fisheries and Oceans Canada, Norwegian Directorate of Fisheries, Marine Scotland Science, and Irish Sea Fisheries Board, prompting international responses coordinated by World Organisation for Animal Health and trade implications considered by World Trade Organization. Epidemiological investigations have relied on spatio-temporal analyses akin to methods from Centers for Disease Control and Prevention and phylogeographic frameworks used at Sanger Institute and Max Planck Institute, tracing links between farmed sites managed by companies like Marine Harvest, Lerøy Seafood Group, and Cooke Aquaculture. Surveillance networks integrating data from European Centre for Disease Prevention and Control-style reporting platforms and national veterinary services have informed zoning, culling, and movement restrictions implemented during outbreaks.
Management strategies include surveillance, fallowing, culling, stamping-out policies enforced by Canadian Food Inspection Agency and Norwegian Food Safety Authority, and vaccination programs developed by researchers at Zoetis, Elanco, and academic groups at University of Stirling and University of Bergen. Biosecurity measures adopted by producers like Grieg Seafood and Mowi involve disinfection protocols, stock separation, and movement controls coordinated with regional authorities such as Marine Scotland and Fisheries and Oceans Canada. Policy instruments have been debated in forums convened by World Organisation for Animal Health, Food and Agriculture Organization, and regional bodies including North Atlantic Salmon Conservation Organization to balance disease control with trade obligations under World Trade Organization rules.
Outbreaks have generated substantial direct losses reported by companies such as Cooke Aquaculture, Grieg Seafood, and Mowi and have affected employment and regional economies monitored by Statistics Norway, Statistics Canada, and Scottish Government agencies. Ecological consequences include potential effects on wild salmonid populations studied by North Atlantic Salmon Conservation Organization, Atlantic Salmon Trust, and researchers at University of Galway, with cascading impacts on marine food webs investigated by teams at Institute of Marine Research and Scottish Association for Marine Science. Trade restrictions and market responses influenced by analyses from Organisation for Economic Co-operation and Development and Food and Agriculture Organization have further shaped the sector's resilience and adaptation strategies.