Dairy farms in California may transmit H5N1 virus through multiple sources

The H5N1 strain of highly pathogenic avian influenza H5N1 has been detected in over 700 herds of dairy cows in California, the largest dairy-producing state in the U.S. A study published in PLOS Biology led by Seema S. Lakdawala at Emory University School of Medicine, U.S. and Jason Lombard at Colorado State University, U.S. suggests that H5N1 is transmitted through multiple, previously unknown sources and that some H5N1 positive cows do not show clinical signs of infection.