HPAI in Dairy Cattle

As of Monday, Dec. 15, 2025, the U.S. Department of Agriculture (USDA) has confirmed highly pathogenic avian influenza (HPAI) in dairy herds in nineteen states. The confirmations were made via milk samples as well as nasal swabs and viral genome sequencing of the affected herds. USDA confirmed that the detections in dairy cows appear to have been introduced…