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

The CDC warns samples of the bird flu virus show signs of mutations that could make it more transmissible to humans. The CDC ...

Here’s what to know about the United States’ first confirmed severe case of H5N1 avian influenza—and how to protect yourself.

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

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

The CDC said Thursday its analysis of samples from a Louisiana patient with bird flu showed mutations not seen in samples ...

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.

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

Genetic analysis suggests the H5N1 virus has the capacity to mutate in ways that could make it more transmissible to humans.

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

The Louisiana patient was hospitalized in critical condition with severe respiratory symptoms from bird flu. According to agency officials, the patient had exposure to sick and dead birds in backyard ...