The Washington State Department of Agriculture has confirmed the state’s first case of highly pathogenic avian influenza, or H5N1, in dairy cattle. The U.S. Department of Agriculture’s National Veterinary Services Laboratory verified positive test results from two dairy cows in Yakima County. State officials say Washington has conducted more than 7,000 surveillance tests for avian influenza over the last two years, and this is the first known detection of the virus in cattle in the state.
The affected farms have been placed under quarantine, strict biosecurity measures are in place, and veterinarians are treating sick animals. Agriculture officials emphasize that pasteurized milk remains safe to consume and do not expect any milk supply shortages. However, producers are being urged to watch for symptoms including reduced milk production, fever, respiratory problems, and changes in feed intake.
Washington State veterinarian Amber Itle says enhanced biosecurity and immediate reporting of symptoms are critical to protecting herds and limiting disease spread. Most cattle affected by H5N1 recover with supportive care, although recovery can take several weeks. Health officials add that the risk to the general public remains low, but people working with potentially infected animals should use appropriate protective equipment.
Audio Reporting by Elizabeth Sanders for Southeast AgNet.