WHO outbreak — Avian Influenza A(H5N5)- United States of America (États-Unis)

Avian Influenza A(H5N5) is circulating in the United States. This is a confirmed outbreak affecting areas across the country, with an affected radius of approximately 500 kilometers. The situation is classified as high severity and remains active as of early December 2025.

If you are currently on site, be aware that human-to-human transmission of this virus is rare, but exposure to infected birds or contaminated environments carries risk. Avoid direct contact with wild birds, poultry, and surfaces that may be contaminated. Do not touch sick or dead birds.

Follow guidance from local health authorities and the CDC regarding any restrictions on poultry farms or bird-related activities in your area. If you develop respiratory symptoms, seek medical attention and inform healthcare providers of potential bird exposure. Monitor official health advisories for updates on affected locations and any travel recommendations.

This alert is based on WHO Disease Outbreak Notification data.