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.

The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of ...

The Centers for Disease Control and Prevention called it the first severe case in the U.S., though the risk to most of the ...

The first severe case of H5N1 bird flu was confirmed in Louisiana. Here is a map of other states that have been affected.

The current risk to the public is low, according to the CDC, but there are certain occupations and situations that can ...

As flu season ramps up in the U.S., influenza is not as simple as it first appears, with several different strains in play.

Bird flu infections are increasing in humans and animals. Learn about the risks, transmission methods, and safety measures to ...

As bird flu infections rise in dairy cattle and chickens, human cases are ticking up too, leaving many people to wonder whether they might be at risk from this recently arrived virus. Bird flu ...

Avian influenza, also called avian flu or bird flu, is an illness that usually affects only birds. There are many different ...

Public concern over bird flu ratcheted up this week as the H5N1 virus continued its sweep through ... The person, who was not identified by name, is one of 61 people identified infected in the ...

Newsom proclaims state of emergency in response to bird flu As the name suggests, avian influenza viruses prefer to infect birds. They break into cells by latching onto sugars that stick up from ...