15.02.2025

The Arizona Department of Agriculture (AZDA), in collaboration with the United States Department of Agriculture (USDA), has confirmed the first detection of H5N1 avian influenza in milk produced by a dairy herd in Maricopa County, Arizona.
The dairy herd that tested positive for the D1.1 H5N1 genotype is currently under quarantine; however, the cattle are exhibiting no symptoms at this time.
This detection resulted from AZDA's implementation of the National Milk Testing Strategy, which was initiated in January and focuses on farm-level bulk tank testing. This case of avian influenza is consistent with the D1.1 genotype and is unrelated to the recent detection of this virus in Nevada.