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.

This month the California Gov. Gavin Newsom declared a state of emergency after epidemiologists confirmed the spread of bird ...

California officials have declared a state of emergency over the spread of bird flu, which is tearing through dairy cows in ...

The bird flu outbreak has spread to all 50 states, infecting dairy cattle, poultry farms and 61 humans across the country.

California Gov. Gavin Newsom declared a public health emergency on Wednesday as bird flu continues to spread among the ...

which can spread a host of germs in addition to bird flu. The U.S. Agriculture Department has stepped up testing of raw milk across the country to help detect and contain the outbreak. A federal ...

Gov. Gavin Newsom said he declared the state of emergency to better position state staff and supplies to respond to the outbreak. California has been looking for bird flu in large milk tanks ...

An elderly patient in Louisiana is in "critical condition" with severe avian influenza, US authorities announced Wednesday, ...