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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.



Ada County, ID
Outbreak Identifier: 7174
Alert ID: 4698
November 05, 2025
Information Only

State Veterinarian

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 2; Gender: Mare; Breed: Mustang; Onset of Clinical Signs: 10/29/2025; Clinical Signs: Acute ataxia all four limbs, lethargy; Confirmation Date: 11/4/2025; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;