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Wildlife Health Bulletin: Winter 2021 Update on Highly Pathogenic Avian Influenza Viruses Circulating Globally in Wild Birds

Detailed Description

USGS National Wildlife Health Center

Wildlife Health Bulletin 2021-03


  • Multiple strains of highly pathogenic avian influenza viruses have been detected globally in wild birds and poultry in 2021.
  • The apparent increase in virus activity noted during the fall migration period warrants increased vigilance by North American wildlife health professionals.
  • Wildlife managers can contact the USGS National Wildlife Health Center (NWHC) to report wildlife mortality events and to discuss submitting carcasses for diagnostic evaluation.


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