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Outbreak of Highly Pathogenic Avian Influenza A Virus in Seals, St. Lawrence Estuary, Quebec, Canada
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Outbreak of Highly Pathogenic Avian Influenza A Virus in Seals, St. Lawrence Estuary, Quebec, Canada
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Journal Article
Outbreak of Highly Pathogenic Avian Influenza A Virus in Seals, St. Lawrence Estuary, Quebec, Canada
2024
Overview
We describe an unusual mortality event caused by a highly pathogenic avian influenza (HPAI) A(H5N1) virus clade 2.3.4.4b involving harbor (Phoca vitulina) and gray (Halichoerus grypus) seals in the St. Lawrence Estuary, Quebec, Canada, in 2022. Fifteen (56%) of the seals submitted for necropsy were considered to be fatally infected by HPAI H5N1 containing fully Eurasian or Eurasian/North American genome constellations. Concurrently, presence of large numbers of bird carcasses infected with HPAI H5N1 at seal haul-out sites most likely contributed to the spillover of infection to the seals. Histologic changes included meningoencephalitis (100%), fibrinosuppurative alveolitis, and multiorgan acute necrotizing inflammation. This report of fatal HPAI H5N1 infection in pinnipeds in Canada raises concerns about the expanding host of this virus, the potential for the establishment of a marine mammal reservoir, and the public health risks associated with spillover to mammals.
