While the farm worker was never tested for influenza, this person did report a day of vomiting and diarrhea before the first cat got sick. One of the two adolescents in the home also reported a cough, sore throat, headache, and myalgia 6 days after the first cat got sick.

Cats in two separate households died in May after developing severe illnesses that were confirmed as the Type A H5N1 bird virus found in U.S. dairy herds, investigators reported. Both were indoor-only cats that had no exposure to infected cattle or birds and didn’t consume raw milk.

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.