Incursion of Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus, Brazil, 2023

4.4 b H5N1 viruses in North America occurred through transatlantic spread via wild birds in late 2021 (2). … 4.4b H5N1 HPAIVs sequenced from wild bird …