The Centers for Disease Control and Prevention called it the first severe case in the U.S., though the risk to most of the public is still low.

Pig cells can be infected by both bird flu and human flu, making pigs a potential “mixing vessel” in which influenza viruses with pandemic potential could be brewed. Has this happened yet? Thankfully, ...

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

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