Bird flu spread from animals to veterinarians — and they didn’t know they were infected: study
A new study shows that bird flu has silently spread from animals to some veterinarians. The study published Thursday by the Centers for Disease Control and Prevention echoes two smaller ones that ...
How are H5N9 and H5N1 different? What to know after California bird flu outbreak
A different strain of H5N9 has shown up in U.S. birds before.