Epidemiological Update Avian Influenza A(H5N1) in the Americas Region – 24 November 2025 – PAHO/WHO

In 2020, the highly pathogenic avian influenza (HPAI) virus subtype H5N1 clade 2.3.4.4b caused an unprecedented number of deaths among wild birds and poultry in numerous countries in Africa, Asia, and Europe. In 2021, this virus spread through…