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.

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Equine Herpesvirus- Neurologic

St. Mary's County, MD

Outbreak Identifier: 7193

Alert ID: 4718

November 18, 2025

Confirmed Case(s) - Official Quarantine

Source: Maryland Department of Agriculture

Number Confirmed: 1;
Number Exposed: Unknown;
Number Euthanized: 1;

Horse 1:
Age: 21; Gender: Gelding; Breed: Paint; Usage: Pleasure Riding; Onset of Clinical Signs: 11/12/2025; Clinical Signs: Found down in the pasture, unable to use back legs to stand; able to get him to stand with a sling, some urine dribbling noted, no fever but decreased anal tone and ataxic on hind limbs; able to stay standing and walk around in a flat area before tripping and going down; humane euthanasia elected at that time; Confirmation Date: 11/17/2025; Horse Status: Euthanized; Vaccination Status: Vaccinated;

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