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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.



Calvert County, MD
Outbreak Identifier: 7187
Alert ID: 4711
November 12, 2025
Confirmed Case(s) - Official Quarantine

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: Weanling; Gender: Colt; Breed: Oldenburg; Usage: Pleasure Riding; Onset of Clinical Signs: 11/5/2025; Confirmation Date: 11/10/2025; Horse Status: Quarantined; Vaccination Status: Status Unknown;