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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.



Hillsborough County, FL
Outbreak Identifier: 7259
Alert ID: 4792
December 11, 2025
Confirmed Case(s) - Official Quarantine

Florida Department of Agriculture and Consumer Services

Number Confirmed: 1; 
Number Exposed: 74; 
Facility Type: Racetrack; 

Horse 1: 
Age: 2; Gender: Filly; Breed: Thoroughbred (TB); Usage: Racing; Onset of Clinical Signs: 12/8/2025; Confirmation Date: 12/10/2025; Horse Status: Affected And Alive; 

Comments: As of Dec 11, 2025 a single case of neurologic EHV-1 has been confirmed within the state of Florida. At this point in time, no other confirmed or suspect cases have been identified. The affected horse, a Thoroughbred racehorse originating from Tampa Bay Downs, is currently undergoing treatment in an isolation facility. The index case affected barn and epidemiological linked barn at Tampa Bay Downs have been quarantined and the remainder of the facility is under increased disease surveillance at the direction of the Florida Department of Agriculture and Consumer Services. The affected horse had been on-site at Tampa Bay Downs since late October, with no known connections to the ongoing U.S. EHM outbreak in Western performance horses.;