Disease Alerts

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.;

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 8; Gender: Mare; Breed: Paint; Usage: Pleasure Riding; Onset of Clinical Signs: 12/6/2025; Clinical Signs: Nasal discharge; Confirmation Date: 12/10/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Patient was a new addition to the barn.;

Comments: Since the last situation report (11/26/2025), there has been one (1) new confirmed positive equine premises identified in Arizona (Maricopa County - new affected county). All confirmed cases in the 2025 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: Arizona Maricopa County (New Affected County) – On December 9, the National Veterinary Services Laboratories in Ames, Iowa, detected VSVNJ by PCR on swab samples from a lesioned wild horse from the Salt River Wild Horse Management Group located in the Tonto National Forest. The Arizona Department of Agriculture has issued an Administrative Order temporarily restricting movement of domestic livestock, including horses, into or out of the affected Lower Salt River area on public land. Since the last situation report (11/26/2025), the 1 affected premises in Gila County has been released from quarantine. Premises that have diagnostic laboratory confirmation of VSV are categorized as confirmed positive premises. Once a county is confirmed as VSV-positive, new equine premises presenting with clinical signs of VSV in that county are not required to be tested for confirmation of the disease, but the premises will be quarantined and classified as a presumptive positive premises. Premises may also be classified as presumptive positive if clinical animals on the premises fail to meet confirmed case definition, but there is diagnostic laboratory evidence of recent VSV infection. Confirmed and presumptive positive premises are quarantined for at least 14 days from the onset of lesions in the last affected animal on the premises.;

Number Confirmed: 3; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Facility Type: Training Facility; 

Horse 1: 
Breed: Standardbred; Clinical Signs: Two standardbreds, one who hasn't raced since June 2025 and another who last raced 11 days ago developed a high fever and submandibular lymph node swelling. Both tested positive for S. equi by PCR. A pony in the same shedrow with a draining abscess also tested positive for S. equi.; Confirmation Date: 12/10/2025; 

Comments: The infected horses are isolated and their care is being supervised by attending veterinarians. Trainers in the affected part of the barn have voluntarily withdrawn their horses from racing and are monitoring horses for fevers and the development of clinical signs of Strangles. Trainers at the facility are working with their veterinarians to institute biosecurity protocols.;

Number Confirmed: 1; 
Number Exposed: 3; 
Facility Type: Private Facility; 

Horse 1: 
Age: 6; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Trail Riding; Onset of Clinical Signs: 12/3/2025; Clinical Signs: Nasal Discharge, Cough; Confirmation Date: 12/8/2025; Horse Status: Quarantined; Vaccination Status: Undervaccinated;

Comments: This is EHV-4. There is no known epidemiological link to this horse and the horses that were exposed at the Waco event. This horse traveled to a trail ride in Alabama. 

Comments: To date 30 cases have been confirmed by the Texas Animal Health Commission with the last case confirmed Nov. 27, 2025. Five of the submitted cases died or were euthanized. Cases have been identified in the following counties: Montgomery, Lee, McLennan, Ellis, Wise, Jefferson, Grimes, Erath, Harris, Randall, Parker, Hood, Fort Bend, Bell and Wharton.;

To follow along with the list of all states with reported EHM positives, go HERE.

Number Confirmed: 1; 
Comments: Horse is displaying neurological clinical signs. The horse did not attend the WPRA or BFA but was stalled with horses that did, including one that tested positive for EHV-1 with only respiratory signs (Alert ID 4765); 
Previous Alerts: 4785, 4764

Number Confirmed: 1; 
Number Euthanized: 1; 
Comments: Horse was retested and did test negative for EHV-1 (nasal and blood). Original test was thought to be a weak positive. Horse was euthanized due to worsening chronic urinary tract issues.; 
Previous Alerts: 4764

Number Confirmed: 1; 
Number Suspected: 2; 
Number Exposed: 11; 

Horse 1: 
Clinical Signs: One horse tested positive for EHM and two suspected for EHV-1 Respiratory; 

Comments: One horse attended the WPRA event and developed mild limb ataxia, tested positive for EHV-1 and has recovered. Two other horses that also attended the event developed fever and respiratory signs but were not tested; theses horses also recovered. Three asymptomatic, exposed horses tested negative.; 
Previous Alerts: 4781, 4724

Number Confirmed: 4; 
Comments: All cases are associated with the EHM outbreak that originated at the Women’s Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event.; 
Previous Alerts: 4724