A genetic analysis suggests the bird flu virus mutated inside a Louisiana patient who contracted the nation’s first severe ...

A backyard flock in Vermont was sickened with H5N1, agricultural officials said on Thursday, following other reports of bird ...

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.

New York Attorney General Letitia James on Friday released what she described as “shocking and disturbing” footage from ...

A new mutation and the first severe case of H5N1 bird flu discovered in a human in Louisiana has raised concern among some ...

The virus has spread among dairy cattle, humans and other mammals. But officials say the current public health risk is low.

Vermont officials reported an H5N1 bird flu outbreak in a backyard flock, leading to the culling of affected birds.

Scientists are issuing warnings after a bird flu patient showed mutations that could increase the transmission of the virus.

Noticing higher prices on eggs -- or maybe empty shelves? You're not alone. Cases of bird flu on the upswing across the ...

Tiny genetic alterations could help the bird flu virus enter cells in the upper respiratory tract, the C.D.C. said. But there ...

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