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Avian Influenza

Summary of Bird Flu in U.S. Poultry

In February 2022, USDA’s APHIS announced an HPAI A(H5N1) virus outbreak in a commercial poultry facility followed by outbreaks in three U.S. states in commercial poultry facilities and a backyard flock, marking the first HPAI A virus detections in commercial poultry in the United States since 2020.

Since February 2022, additional H5N1 bird flu outbreaks have been identified in poultry, including both commercial and backyard flocks in multiple states. The latest bird flu outbreaks in poultry in the United States are available from the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) webpage at USDA APHIS | 2022 Confirmations of Highly Pathogenic Avian Influenza in Commercial and Backyard Flocks.

Preliminary genetic sequence data from some of the H5N1 bird flu viruses obtained from infected poultry suggests they belong to clade, like most of the viruses recently detected in wild birds in the United States.