Livestock on U.S. farms continue to become infected with high pathogenic avian influenza (HPAI).
Researchers have speculated that the virus spread through milk droplets on milking machines or through farm worker clothing.
As of April 11, 17 states, including Kentucky, Pennsylvania, Tennessee, Utah and California, have put import restrictions in place, the American Veterinary Medical Association says.
Cows aren’t the only other animals to be exposed to bird flu.
In January of this year, scientists confirmed cases of bird flu in fur and elephant seal populations in Antarctica, according to Reuters.