A dairy worker in Colorado has become the fourth human in the United States to test positive for bird flu (H5N1) this year. The man, who had direct contact with infected cattle, reported only mild symptoms including pink eye.
The Centers for Disease Control and Prevention (CDC) and state health departments in Colorado and other affected states have been monitoring the outbreak among dairy cattle closely. As of July 1, there have been 97,263,548 poultry kills due to the avian flu outbreak that began early in 2022.
The CDC recommends that anyone in contact with dairy cattle wear protective equipment including an N95 respirator, eye protection, and gloves. Hands should be washed afterwards with soap and water or an alcohol-based hand rub. People who have regular exposure to infected animals are at increased risk and should take precautions when handling them.
The CDC is in discussions about whether to deploy 4.8 million doses of bird flu vaccine for farm workers, but personal protective equipment and antivirals are currently the primary methods of prevention.
Three other humans in Michigan, Texas, and Colorado have also recovered from bird flu this year. The virus has been detected in a variety of animals including sea lions, bears, and even mountain lions. However, there is no indication that it has mutated in ways that facilitate easy spread to or among humans.
The USDA is offering financial assistance for dairy farmers with H5N1-positive cows through its financial assistance program.