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Equine Herpesvirus Myeloencephalopathy (EHM) Outbreak
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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.



Clark County, WI
Outbreak Identifier: 7056
Alert ID: 4577
September 12, 2025
Confirmed Case(s) - No Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Gender: Gelding; Breed: Standardbred; Onset of Clinical Signs: 8/27/2025; Clinical Signs: Ataxia, fever, hyperesthesia; Horse Status: Deceased; Vaccination Status: Unvaccinated;