Scientists believe the mutations may allow the virus to better bind to receptors in the upper airways of humans.

The bird flu virus found in a severely ill patient hospitalized in the US has mutated to become better adapted to human ...

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

The bird flu virus found in a severely ill patient hospitalized in the United States has mutated to become better adapted to ...

A devastating bird flu outbreak has killed 20 big cats at the Wild Felid Advocacy Center of Washington, a nonprofit animal ...

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

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 ...

The agency, in its latest update released Thursday, said the mutations were not found in samples taken from wild birds, ...

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

The CDC said that testing of a person with a severe case of bird flu indicated the virus had mutated but the risk remains low ...