Doctors say the case of a teen left in critical condition shows H5N1 "can cause severe human illness." Mutations in the virus are deepening concerns about the spread of H5N1.

In coming years, the bird flu may cost billions of dollars more in expenses and losses. Worse, the outbreak poses the threat ...

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

The patient in Louisiana who was hospitalized with severe bird flu illness was found to have a mutated version of the virus.

Each week some revelation about bird flu seems to flutter through the news cycle. Here's what the latest research is saying ...

It was like watching a field hospital on an active battlefront treating hundreds of wounded soldiers,” a livestock veterinarian said.

The U.S. isn't fully capturing spread in pets like cats, compared to surveillance for livestock and people, said the study’s senior author, Suresh Kuchipudi, a professor and chair of infectious ...

Meanwhile, cases of bird flu continue to spread among dairy cattle in the country, with nearly 900 dairy herds impacted ...

But while the current risk from our fuzzy feline friends is considered very low, public health officials nonetheless have ...