Avian influenza found in dairy cattle in Maricopa County

On February 11, 2025 the Arizona Department of Agriculture (AZDA), working in conjunction with the United States Department of Agriculture (USDA), confirmed Arizona’s first identified H5N1 avian influenza detection in milk produced by a dairy herd in Maricopa County. As a protective measure, the facility is currently under quarantine. Unlike other detections involving B3.13 H5N1, cattle have not yet displayed signs of illness with this particular D1.1, but if clinical symptoms become evident, cattle will be isolated from the main herd.