October 17, 2025

Following an investigation by the Michigan Department of Agriculture and Rural Development (MDARD), the Michigan State University Veterinary Diagnostic Laboratory has detected the presence of highly pathogenic avian influenza (HPAI) in a backyard flock from Ottawa County. This is the ninth case of HPAI in poultry from an Ottawa County flock since the virus was first detected in Michigan in 2022, and the fourth case detected in poultry in the county this year. Adhering to biosecurity measures and using personal protective equipment (PPE) continues to be vital in ensuring the health of Michigan’s domestic animals and the public.