No evidence was found of the highly pathogenic H5N1 strain, which caused mortality in parts of Asia, Europe and Africa. There was no evidence that this strain occurred in North American wild birds.

Digitally-colourised, negative-stained transmission electron microscopic (TEM) image depicting influenza A virions A single mutation in the H5N1 strain of avian influenza that is infecting cattle ...

The Biden administration faced significant bird flu outbreaks during its tenure, with the H5N1 virus causing widespread impacts across the United States. Here’s an overview of the outbreaks and ...