Outbreaks | Equine Disease Communication Center

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.

Disease

Outbreak States

Start Date

End Date

Equine Herpesvirus- Neurologic

Gallatin County, MT

Outbreak Identifier: 6781

Alert ID: 4275

March 24, 2025

Confirmed Case(s) - Official Quarantine

Source: Montana Department of Livestock

Number Confirmed: 1;
Number Exposed: 17;
Number Euthanized: 1;
Facility Type: Boarding Facility;

Horse 1:
Age: 22; Gender: Mare; Breed: Appaloosa; Usage: Pleasure Riding; Onset of Clinical Signs: 3/10/2025; Clinical Signs: Urine retention, bladder atony, hindlimb ataxia; Confirmation Date: 3/14/2025; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: The premises is a boarding facility with no travel history in the two weeks prior to the presentation of clinical signs. The state veterinarian reports that the risk to the general horse population of Gallatin County is relatively low.;

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