A Michigan dairy worker has been diagnosed with bird flu — the second human case associated with an outbreak in U.S. dairy cows.

The male worker had been in contact with cows at a farm with infected animals. He experienced mild eye symptoms and has recovered, U.S. and Michigan health officials said in announcing the case Wednesday.

A nasal swab from the person tested negative for the virus, but an eye swab tested Tuesday was positive for bird flu, “indicating an eye infection,” U.S. Centers for Disease Control and Prevention officials said.