Virus

Influenza A virus

Influenza A virus subtype H5N1

Biology

Phylogenetics

Zoology

Gene

Habitat

Virology

Geography

Ecology

Waterfowl

Flyway

Lineage (genetic)

Avian influenza virus

Highly pathogenic

Clade

Genetics

Emerging infectious diseases

We detected Eurasian-origin highly pathogenic avian influenza A(H5N1) virus belonging to the Gs/GD lineage, clade 2.3.4.4b, in wild waterfowl in 2 Atlantic coastal states in the United States. Bird banding data showed widespread movement of waterfowl within the Atlantic Flyway and between neighboring flyways and northern breeding grounds.

Intercontinental Movement of Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4 Virus to the United States, 2021