Genetic Sequencing Results for Washington Dairy Herd Detection of Highly Pathogenic Avian Influenza
On October 8, 2026, USDA’s Animal and Plant Health Inspection Service (APHIS) announced the first two detections of highly pathogenic avian influenza (HPAI) in two dairy herds in Washington. On October 8, the National Veterinary Services Laboratories (NVSL) completed whole genome sequencing and confirmed that the virus is H5N1 genotype B3.13. Analysis indicates that this detection is consistent with transmission of virus from Idaho to Washington likely through cattle movement.
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