Highly Pathogenic Avian Influenza (HPAI) H5N1 Virus in Livestock

AVIAN INFLUENZA CONFIRMED IN THREE CALIFORNIA DAIRY HERDS

Three Central Valley farms quarantined; no human cases detected; no threat to the milk or food supply

SACRAMENTO, August 30, 2024 — Cows at three California dairies located in the Central Valley have tested positive for highly pathogenic avian influenza (HPAI).

When herds began showing clinical signs consistent with HPAI on August 25, 2024, the dairy owners worked with their veterinarians and the California Department of Food and Agriculture (CDFA) to submit samples to the California Animal Health and Food Safety (CAHFS) laboratory network for preliminary determination. The samples were then submitted to the National Veterinary Services Laboratory (NVSL), where the test results were confirmed today.