On May 20, 2024, the Michigan Department of Agriculture and Rural Development (MDARD) announced the detection of highly pathogenic avian influenza (HPAI) in additional dairy herds from Clinton, Gratiot, and Ionia counties.

Testing through the Michigan State University Veterinary Diagnostic Laboratory detected this case. Samples have been sent to the U.S. Department of Agriculture’s (USDA) National Veterinary Services Laboratories for additional confirmatory testing.