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.

Bird flu infects many species, including wild animals, according to the United Nations. Ducks, quail and at least one eagle have been euthanized due to the virus. A global outbreak of H5 bird flu has infected millions of animals since 2020. The virus can infect chickens, cows and, more rarely, humans.

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

As bird flu cases continue to pop up in humans, Canada announced Wednesday that it purchased 500,000 doses of vaccine targeted at the virus. Here’s what you need to know about bird flu vaccinations in the U.

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).

H5N1 bird flu is branching out. New data from the Centers for Disease Control and Prevention indicates that a second type of H5N1 has likely spread from dairy cows to humans.

A Wyoming woman hospitalized with bird flu is the state's first human case after her flock of chickens became infected and died, according to state officials.

Out of 150 participating veterinary practitioners across the country, three had antibodies indicating recent infection with Type A H5N1 bird flu, based on blood samples collected in September 2024, noted Samantha Olson, MPH, of the CDC's National Center for Immunization and Respiratory Diseases, and colleagues.