The virus is spreading among animals, while viral mutations raise concerns about potential adaptation to human hosts.

The CDC has confirmed a total of 66 human cases of bird flu across the United States as of Friday, although the number is ...

The virus in the first severe human bird flu case in the U.S. was found to have mutated. Newsweek's live blog is closed.

A patient has been hospitalized with a severe case of H5N1 infection in Louisiana, the CDC said. This is first instance of a ...

An elderly patient in Louisiana is in "critical condition" with severe avian influenza ... This genotype has recently been ...

A patient in Louisiana has been hospitalized with a severe case of H5N1 bird flu, the US Centers for Disease Control and ...

The U.S. reported its first severe human case of bird flu on Wednesday in a Louisiana resident who is hospitalized in ...

California Governor Gavin Newsom declared a state of emergency after hundreds of dairy herds were found to have bird flu with ...

The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of ...

Last month, a teenager in Canada was also hospitalized with a severe case of bird flu. According ... has recently been detected in wild birds and poultry in the United States, and in human cases ...