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Animal and Plant Health Inspection Service
U.S. Department of Agriculture
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2022 Detections of Highly Pathogenic Avian Influenza in Mammals

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Learn more about 2022 detections of HPAI in Commercial and Backyard Flocks and HPAI in Wild Birds

There are many species that are potentially susceptible to HPAI. In addition to birds and poultry, H5N1 viruses have been detected in some mammals (see list below). Infection may cause illness, including severe disease and death in some cases.

Avian influenza is caused by influenza Type A virus (influenza A). Avian-origin influenza viruses are broadly categorized based on a combination of two groups of proteins on the surface of the influenza A virus: hemagglutinin or “H” proteins, of which there are 16 (H1-H16), and neuraminidase or “N” proteins, of which there are 9 (N1-N9). Many different combinations of “H” and “N” proteins are possible. Each combination is considered a different subtype, and related viruses within a subtype may be referred to as a lineage. Avian influenza viruses are classified as either “low pathogenic” or “highly pathogenic” based on their genetic features and the severity of the disease they cause in poultry. Most viruses are of low pathogenicity, meaning they causes no signs or only minor clinical signs of inflection in poultry.

State County Date Collected Date Detected HPAI Strain Species


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