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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West Nile Virus

Mercer County, KY

Outbreak Identifier: 6991

Alert ID: 4507

August 23, 2025

Confirmed Case(s) - No Quarantine

Source: Kentucky Department of Agriculture

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

Horse 1:
Age: 4; Gender: Filly; Breed: Standardbred Cross; Usage: Pleasure Riding; Onset of Clinical Signs: 8/19/2025; Clinical Signs: Examined by veterinarian on 8/19 and described as having severe ataxia; Confirmation Date: 8/22/2025; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: This is the 4th KY equine confirmed as being affected by West Nile virus this calendar year. None of the 4 horses were reported as having been vaccinated against WNV;

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