Washington State officials confirmed that highly pathogenic avian influenza (HPAI) – commonly known as bird flu – has spread to dairy cattle in the region. The first two infected herds were identified in Yakima County in early October, and a third case was reported in Benton County on Oct. 26. In just three weeks, a total of 27 dairy farms have tested positive.

State response and containment efforts

State veterinarian Amber Itle explained that the virus is moving quickly despite extensive containment work. “The risk for humans is very low,” she said, adding that milk from an infected cow does not pose a threat to consumers. The department still recommends drinking only pasteurized milk, as the heating process destroys the virus. No cases of the virus have been found in meat.

Because scientists are still learning how HPAI spreads among cattle, officials acknowledge that controlling the outbreak will be challenging. Known transmission routes include moving sick cows and using contaminated equipment between farms. Researchers also suspect that flies, wind, and even birds traveling between farms could carry the virus.

Testing and monitoring

Washington becomes the 20th state to detect avian influenza in dairy cattle. Over the past two years, the Washington Animal Disease Diagnostic Laboratory performed more than 7,000 bird‑flu tests on individual farms, all of which were negative until the recent surge.

In response, the Department of Agriculture is testing every farm in the affected milkshed on a weekly basis. Farmers are urged to isolate any animals showing symptoms and to report concerns promptly by emailing the department or calling the provided hotline.

Impact on dairy operations

Symptoms in cattle include reduced milk production, changes in milk appearance, loss of appetite, fever, respiratory problems, and altered manure. When treated appropriately, most infected cattle recover within six weeks.

Local dairy producers are working closely with state veterinarians to implement biosecurity measures, such as disinfecting equipment, limiting animal movement, and monitoring for signs of illness. The swift coordination aims to protect both the agricultural economy and public health.

What consumers need to know

Consumers can continue to purchase dairy products without fear. Pasteurization effectively eliminates the virus, and there is no evidence that the disease has entered the meat supply. The department’s guidance reinforces the safety of the food chain while the outbreak is contained.

For further information or to report suspected cases, Washington residents can contact the State Department of Agriculture at the email address or phone number listed in the original notice.

Original reporting: Clark County Today (Vancouver WA) — read the source article.