California officials have confirmed H5N1 avian flu outbreaks in three dairy herds. Clinical signs consistent with highly pathogenic avian influenza (HPAI) emerged between Aug. 23-25, leading to testing by the California Animal Health and Food Safety lab and confirmation by the National Veterinary Services Laboratory.
The affected dairies are now under quarantine, with enhanced biosecurity measures. Sick cows are isolated and treated, while healthy cows continue to ship milk for pasteurization. The ongoing investigation has traced recent animal movements, prioritizing additional testing based on epidemiologic risk.
The Centers for Disease Control and the California Department of Public Health have said this flu strain poses a low risk to public health.
