Epidemiological Update - Avian Influenza A(H5N1) in the Americas Region - 11 March 2026

Between 1 January 2025 and 9 March 2026, influenza A(H5N1) detections were reported in 37 mammalian species across two countries and in 94 bird species across 11 countries and territories in the Americas. Reports during 2025 indicate a decline in detection among wild birds since mid-2025, with a growing predominance of outbreaks in poultry and other domestic birds.

Between 20 April 2022 and 9 March 2026, a total of 75 human infections caused by avian influenza A(H5N1), including two deaths, were reported in five countries in the Americas, with no additional cases since the last PAHO/WHO epidemiological update on avian influenza on 24 November 2025.