So far, the H5N1 virus isn't transmitted between people — but the CDC has found a mutation in a human case "concerning." ...

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

The virus in the first severe human bird flu case in the U.S. was found to have mutated. Follow Newsweek's live blog for ...

Exclusive reporting reveals how the United States lost track of a virus that could cause the next pandemic. Problems like the ...

“The risk to members of the general public who do not have exposure to infected ... Experts say it’s unlikely this specific ...

At baseline, bird flu is usually severe in humans. Of the 863 reported H5N1 bird flu cases reported worldwide between 2003 ...

Bird flu, while rare in humans, can cause symptoms ranging from mild fever to severe pneumonia. It spreads via contact with infected birds or surfaces.

H5N1 usually spreads to people through contact with infected or dead birds, as with the Louisiana patient. Currently, there ...

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.

As bird flu infections rise in dairy cattle and chickens, human cases are ticking up too, leaving many people to wonder ...

California Gov. Gavin Newsom declared a state of emergency on Wednesday in response to the growing bird flu crisis.