A severe case of bird flu in Louisiana has led to the discovery of mutations in the H5N1 virus, which may help it bind more ...

Growing concerns surrounding the transmission of H5N1 bird flu. The CDC reports that samples collected from a severely ill ...

There's a new concern that the virus could evolve to spread from human to human.

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

ALEXANDRIA, La. (KALB) - The bird flu virus in a patient in Louisiana has likely mutated while they were in the hospital.

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

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

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

Genetic analysis suggests the bird flu virus has the capacity to mutate in ways that could make it more transmissible to ...

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

Samples from a hospitalized patient in Louisiana show changes that could make the H5N1 virus spread more easily between ...