On 23 October 2026, the U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) has confirmed the detection of highly pathogenic avian influenza (HPAI) H5N1 in 18 dairy herds (special ID: WA 011~WA 028) in Washington. 17 of which from Yakima county and 1 of which from Benton county.