Highly Pathogenic Avian Influenza Detected in Additional Flocks from Ottawa, Monroe, and St. Clair Counties

By Jennifer Holton

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 three commercial flocks from Ottawa County, one backyard flock in Monroe County, and a backyard flock in St. Clair County. Since the virus was first found in Michigan in 2022, these latest detections bring the total number of HPAI cases in poultry from an Ottawa County flock to 15. For poultry cases in 2025, there have been 10 cases of HPAI in Ottawa County, four cases in Monroe County, and one in St. Clair County. Farmers and producers of all sizes need to continue implementing and adhering to biosecurity measures and using personal protective equipment (PPE) continue to be vital in helping ensure the health of Michigan’s domestic animals and the general public.

HPAI is a highly contagious virus that can be spread in various ways from flock to flock, including by wild birds, through contact with infected animals, by equipment, and on the clothing and shoes of caretakers.

According to the U.S. Centers for Disease Control and Prevention, the public health risk associated with avian influenza remains low. As a reminder, people should properly handle and cook all poultry and eggs.

Whether it’s a few backyard birds or a large commercial flock, following a few key steps is fundamental to protecting the health and vitality of Michigan’s domestic birds:

• Prevent contact between domestic and wild birds by bringing them indoors or ensuring their outdoor area is fully enclosed.
• Wash your hands before and after handling birds as well as when moving between different coops.
• Disinfect boots and other gear when moving between coops.
• Do not share equipment or other supplies between coops or other farms.
• Clean and disinfect equipment and other supplies between uses. If it cannot be disinfected, discard it.
• Use well or municipal water as drinking water for birds.
• Keep poultry feed secure to ensure there is no contact between the feed/feed ingredients and wild birds or rodents.