Highly pathogenic avian influenza (HPAI)* A(H5) viruses have been detected in U.S. wild aquatic birds, commercial poultry and backyard and hobbyist flocks beginning in January 2022. These are the first detections of HPAI A(H5) viruses in the United States since 2016. Preliminary genetic sequencing and RT-PCR testing on some virus specimens shows these viruses are HPAI A(H5N1) viruses from clade 2.3.4.4b.
Wild birds can be infected with highly pathogenic avian influenza (HPAI) and show no signs of illness. They can carry the disease to new areas when migrating, potentially exposing domestic poultry to the virus.
APHIS’ wild bird surveillance program provides an early warning system for the introduction and distribution of avian influenza viruses of concern in the United States, allowing APHIS and the poultry industry to take timely and rapid action to reduce the risk of spread to our poultry industry and other populations of concern.
Confirmed HPAI Detections in Wild Birds
