Avian influenza has spread far beyond the nation's birds, infecting all manner of creatures from zoo animals, wild mammals, ...

The agency, in its latest update released Thursday, said the mutations were not found in samples taken from wild birds, suggesting the virus changed over the course of the patient’s infection.

Did you ever wonder why California is always in an emergency? Bird flu is the latest one. Gov. Gavin Newsom signed a declaration of emergency on Dec. 18 after a severe case in a human was documented.