A 13-year-old girl in Canada became so sick with H5N1, or bird flu, in late 2024 that she had to be put on a ventilator.

In light of the ongoing global spread of the H5N1 avian influenza, U.S. public health experts are reassured that current ...

Highly pathogenic avian influenza A(H5N1) viruses have caused widespread infections in dairy cows and poultry in the United ...

Most human cases of bird flu in North America have been mild, a fact that’s underscored by a new study of the first 46 ...

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

A virologist explains that why this probably isn’t the big one — but that it’s a sign of bad things happening with the virus.

Here's what to know about the spread of H5N1 bird flu in the ... In May, authorities in Mexico confirmed a fatal human case ...

For influenza viruses, imperfection is a strength. They constantly mutate, producing new strains that challenge immune ...

The United States’ first ... cases of bird flu have been detected in 13 states since December. Health officials say there is little to no risk for transmission to humans with respect to H5N2.

California officials have declared a state of emergency over the spread of bird flu, which is tearing ... This week, health officials confirmed the first known case of severe illness in the ...