With so much H5N1 circulating in the U.S., scientists worry we are a few mutations away from a potential human pandemic.

Amid rising respiratory illnesses, a CDC report reveals undetected bird flu cases in US veterinarians. The spread, shown through antibody tests, indicates infections occurring beyond known zones. Experimental confirmation of H5N1 transmission through cow milk prompts officials to urge all states to join the national milk testing program.

COLUMBUS, Ohio (WSYX) — Ohio has its first case of bird flu transmitted to a person, according to state health officials. The Ohio Department of Health on Wednesday announced the state’s first probable human case of influenza A (H5), also known as Highly Pathogenic Avian Influenza (HPAI).