Breaking News
Equine Herpesvirus Myeloencephalopathy (EHM) Outbreak
Learn More

Disease Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.



Shiawassee County, MI
Outbreak Identifier: 7099
Alert ID: 4618
September 25, 2025
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture and Rural Development

Number Confirmed: 1; 
Number Suspected: 2; 
Number Exposed: 9; 

Horse 1: 
Age: 12; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/15/2025; Clinical Signs: nasal discharge, swollen lynph nodes; Confirmation Date: 9/23/2025; Horse Status: Recovering; Vaccination Status: Unvaccinated;