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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.



Equine Herpesvirus- Neurologic
Hancock County, ME
Outbreak Identifier: 5985
Alert ID: 3427
October 19, 2023
Confirmed Case(s) - Official Quarantine

Maine Department of Agriculture, Conservation & Forestry

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 30; 
Number Euthanized: 2; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 13; Gender: Mare; Breed: Thoroughbred (TB); Usage: Pleasure Riding; Onset of Clinical Signs: 10/7/2023;
Clinical Signs: Acute neurologic symptoms focused on hind end, progressing to recumbancy; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: In order to prevent spread of disease, a quarantine has been placed at the affected property. A quarantine means that movement of equines is restricted (no equines on or off the property) until the quarantine is released.;
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