The state has required precautionary bulk milk testing since November for Pennsylvania's roughly 4,900 dairy farms.

Cows don’t typically get the flu. The recent H5N1 flu outbreak in U.S. dairy herds is a wake-up call, not just about the virus but about a federal system failing to protect our food supply.

Horses have been infected by bird flu without symptoms, raising concerns the virus could spread to other species, including ...

Scientists are concerned that the H5N1 virus could set off another human pandemic. But it is already putting species under ...