FILE - Dairy cattle feed at a farm in New Mexico on March 31, 2017. A fourth dairy worker in the U.S. has been infected with bird flu. On Wednesday, July 3, 2024, U.S. health officials said a fourth dairy worker has been infected with bird flu in the outbreak linked to U.S. dairy cows. The man, who worked on a Colorado farm where dairy cows tested positive for the virus, developed conjunctivitis or pink eye, Colorado health officials said. The worker received antiviral treatment and has recovered. (AP Photo/Rodrigo Abd, File)