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.

Spread from animals to humans is unlikely; overall risk to community members remains low

Maricopa County Department of Public Health (MCDPH) is working closely with state and federal partners to respond to detection of avian influenza in a small number of animals that are part of a zoo collection in Litchfield Park. Overall risk to the public and zoo visitors remains low.

Poultry at a commercial farm located in Pinal County have tested positive for Avian Influenza. When the poultry began showing clinical signs consistent with avian influenza on November 11, 2024, samples from the location were submitted to the Arizona Veterinary Diagnostic Lab (AZVDL) for preliminary determination, then submitted to the National Veterinary Services Laboratory (NVSL) for confirmation. Eggs produced after the onset of illness have not entered the food supply. Consumers in Arizona and around the nation can remain confident in the safety and quality of eggs and egg products.