H5N1 bird flu kills thousands of New England seals BirdFlu Flu H5N1 NewEngland Seals CDC_NCEZID
Dispatch: Highly Pathogenic Avian Influenza A Virus Outbreak in New England Seals, United States. Image Credit: Ondrej Prosicky / Shutterstock
Phoca vitulina and Halichoerus grypus have been known to be susceptible to influenza A infections, and previous outbreaks involved transmission from seal to seal without an intermediate avian host. These outbreaks indicate a potential route of viral adaptation to mammalian hosts and have considerable implications for human health.
An increase in seal strandings during the second wave of infections in avian species led to the declaration of an unusual seal mortality event by the National Oceanic and Atmospheric Administration, beginning in June 2022. These strandings included 11 gray seals and 164 harbor seals, and samples were collected from 35 of those harbor seals and six gray seals.
Results The results of the swam sample analyses revealed that 17 of the harbor seal samples and two of the six gray seal samples were positive for the highly pathogenic H5N1 avian influenza virus, and the samples were found in regions with suspected H5N1 outbreaks among seabird species such as cormorants, eiders, terns, and gulls. In some cases, the seals exhibited respiratory symptoms, with neurologic symptoms present in a subset of these.
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