The patient in Louisiana who was hospitalized with severe bird flu illness was found to have a mutated version of the virus.

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

Previous seasonal flu infections and vaccinations may protect us against infection from the highly pathogenic H5N1 bird flu outbreak.

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 genetic analysis suggests the bird flu virus mutated inside a Louisiana patient who contracted the first severe case of the ...

The CDC recently confirmed a severe human case of bird flu – the latest in an upsurge in virus activity this year. How ...

Doctors say the case of a teen left in critical condition shows H5N1 "can cause severe human illness." Mutations in the virus are deepening concerns about the spread of H5N1.

There's no evidence that the bird flu is spreading from person to person. Nearly all of the people who have gotten sick had direct contact with animals, except for a patient in Missouri who was ...

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 individual had exposure to sick and dead birds that are suspected to have been infected with H5N1," the virus that causes bird flu. The patient has since been hospitalized. At least 60 human ...

An older person in Louisiana exposed to bird ... patient is reported to have underlying medical conditions and is over the age of 65, putting them at extra risk for complications from the flu ...

A genetic analysis of viral samples from a patient in Louisiana hospitalized with the first severe case of bird flu showed ...