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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.



Beaverhead County, MT
Outbreak Identifier: 7168
Alert ID: 4692
October 31, 2025
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 4; 
Number Suspected: 10; 
Number Exposed: 75;

Comments: This is the same location as Alert ID: 4691. Five horses are dually infected with Equine Herpesvirus-Respiratory.