Disease Alerts

Number Confirmed: 1; 
Number Exposed: 13; 
Number Euthanized: 1; 
Facility Type: Training Facility; 

Horse 1: 
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Usage: Racing; Clinical Signs: Unthrifty, poor body condition, tested for interstate movment requirements; Confirmation Date: 12/23/2025; Horse Status: Euthanized; 

Comments: Confirmatory testing for cohorts is pending.;

Comments: Since the last situation report (12/9/2025), there has been one (1) new confirmed VSVpositive equine premises identified in Arizona (Santa Cruz County). All confirmed cases in the 2025 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Since the last situation report (12/9/2025), 1 affected premises in Santa Cruz County was 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. 

For more information, go to https://www.aphis.usda.gov/sites/default/files/vsv-sitrep-12-30-25.pdf

Number Confirmed: 1; 
Number Exposed: 27; 
Facility Type: Training Facility; 

Horse 1: 
Age: 4; Gender: Mare; Breed: Warmblood (WB); Usage: Trail Riding; Onset of Clinical Signs: 12/29/2025; Clinical Signs: Febrile. Neurological deficits including hindlimb lameness; urine dribbling.; Confirmation Date: 12/29/2025; Horse Status: Quarantined; Vaccination Status: Status Unknown;

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; 

Comments: The quarantine has been released as of Dec. 29, 2025.; 
Previous Alerts: 4792

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 

Horse 1: 
Age: 13; Gender: Gelding; Breed: Quarter Horse Cross; Onset of Clinical Signs: 12/15/2025; Clinical Signs: Fever, nasal discharge, increased respiratory rate,; Confirmation Date: 12/24/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Number Confirmed: 2; 
Number Exposed: 3; 
Comments: All of our hold orders were released around 12/7 to 12/10. Our last quarantine was released on 12/21. As of right now, we have no active cases.; 
Previous Alerts: 4743

Number Confirmed: 1; 
Number Exposed: 2; 
Comments: All of our hold orders were released around 12/7 to 12/10. Our last quarantine was released on 12/21. As of right now, we have no active cases.; 
Previous Alerts: 4732

Number Confirmed: 1; 
Number Exposed: 52; 
Facility Type: Boarding Facility; 
Comments: All traces have been conducted.;

Number Confirmed: 1; 
Number Exposed: Unknown; 
Comments: Notice of quarantine release; 
Previous Alerts: 4730, 4723

Number Confirmed: 3; 
Comments: This quarantine has been released.; 
Previous Alerts: 4721