Incursion of Highly Pathogenic Avian Influenza A(H5N1) Clade Virus, Brazil, 2023

We report 4 highly pathogenic avian influenza A(H5N1) clade viruses in samples collected during June 2023 from Royal terns and Cabot´s terns in Brazil. Phylodynamic analysis revealed viral movement from Peru to Brazil, indicating a concerning spread of this clade along the Atlantic Americas migratory bird flyway.