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 ...

First come the horseshoe crabs. Hoisting their round, tank-like shells, they trundle out of the Delaware Bay under the first ...

The most common kind of bird flu is the H5N1 strain ... A few cases of severe pneumonia and death have been reported in China. Doctors can’t diagnose bird flu just by your symptoms.

They are investigating three other possible cases of bird flu in three cats from a different household. The two infected cats died, and this type of flu is rare in cats, health officials say.

The U.S. reported its first severe human case of bird flu on Wednesday in a Louisiana resident who is hospitalized in ...

Beyond the bird flu, the federal government’s handling of the outbreak reveals cracks in the U.S. health security system that would allow other risky new pathogens ... any kind of reset in ...

A patient in Louisiana has been hospitalized with a severe case of H5N1 bird flu, the U.S. Centers for Disease Control and ...

At least one of the bird flu variants present in the U.S. is capable of causing severe disease in people. Multiple avian flu variants are circulating simultaneously and new ones emerge as the ...

The first severe human case of H5N1 in the U.S. and California's state of emergency are deepening concerns about the spread of the virus. How to prevent getting sick.

The virus, also known as Type A H5N1, was detected for the first time in U.S. dairy cattle in March. Since then, bird flu has been confirmed in at least 866 herds in 16 states. The virus has been ...