The physical space of the MSK Library is permanently closed to visitors as of Friday, May 17, 2024. Please visit this guide for more information.
The physical space of the MSK Library is permanently closed to visitors as of Friday, May 17, 2024. Please visit this guide for more information.
APHIS is continuing to process samples collected over the past year from State and partner agencies and will continue to post this information on this page. The detection date is the date of National Veterinary Services Laboratories confirmatory testing. APHIS will provide updates below when there are significant differences between sample collection and detection dates.
Both maps represent samples collected by APHIS Wildlife Services as well as morbidity/mortality samples submitted by State agencies and private facilities. The data presented visually in these maps is also available in the table below.
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.