The progression of the species-jumping disease has been unprecedented, including the first-ever U.S. cases of infections in ...

The current bird flu outbreak in Massachusetts is the largest the state has ever seen. Here's why officials believe it has ...

In today’s Health Alert, a new strain of bird flu - H5N9 - has been detected in the U.S. The first confirmed case was found ...

U.S. authorities also detected the more common H5N1 strain on the same farm in Merced County, California, they said in a ...

Philadelphia health officials say a goose found next to Carroll Park in West Philadelphia had highly infectious bird flu.