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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.



Saratoga County, NY
Outbreak Identifier: 6879
Alert ID: 4400
June 13, 2025
Quarantine Released

State Animal Health Official

Number Confirmed: 1; 
Number Exposed: 43; 
Facility Type: Racetrack; 
Comments: The New York State Department of Agriculture & Markets, The New York Racing Association, Inc. (NYRA) and the New York State Gaming Commission (NYSGC) have released Barn 85 at Saratoga Race Course after completing a 14-day official quarantine due to a positive case of strangles in that barn. Only the index horse was confirmed to have strangles and the colt remains quarantined offsite for treatment. Starting Saturday, June 14, 2025, all horses currently stabled in Barn 85 will have no longer have any training or racing restrictions.; 
Previous Alerts: 4384

Montérégie, QC
Outbreak Identifier: 6889
Alert ID: 4399
June 12, 2025
Confirmed Case(s) - Voluntary Quarantine

MAPAQ

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

Horse 1: 
Age: 2; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: Respiratory; Confirmation Date: 6/11/2025;

Montgomery County, PA
Outbreak Identifier: 6888
Alert ID: 4398
June 12, 2025
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Exposed: 38; 
Facility Type: Stable; 

Horse 1: 
Age: 6; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 6/2/2025; Clinical Signs: Fever, cough; Confirmation Date: 6/11/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Essex County, MA
Outbreak Identifier: 6887
Alert ID: 4397
June 10, 2025
Information Only

State Vet

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

Horse 1: 
Onset of Clinical Signs: 5/29/2025; Horse Status: Affected And Alive;

Calgary, AB
Outbreak Identifier: 6886
Alert ID: 4396
June 10, 2025
Confirmed Case(s) - Official Quarantine

Canadian Food Inspection Agency

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Comments: On June 4, 2025, positive equine infectious anemia (EIA) results were confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for a horse located on a premises in Calgary, Alberta. The horse had been tested by an accredited veterinarian at the owner’s request to fulfill a facility biosecurity requirement. No clinical signs of the disease were noted at the time of sampling. A CFIA investigation is underway and as per program policy, movement controls have been placed on the infected horse and any on-premises contact animals. Initial reports indicate there are other equines on the affected premises. Movement controls will remain until all disease response activities have been completed, including follow-up testing and ordering the destruction of confirmed cases. Trace-out activities may require the CFIA to undertake actions at additional premises as outlined in the current policy. Improved biosecurity protocols have been strongly recommended to the owners to help control the ongoing spread of EIA and protect our national herd.;

Lebanon County, PA
Outbreak Identifier: 6885
Alert ID: 4395
June 09, 2025
Confirmed Case(s) - No Quarantine

Source: Attending Veterinarian and State Veterinarian 

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

Los Angeles County, CA
Outbreak Identifier: 6858
Alert ID: 4394
June 07, 2025
Quarantine Released

California Department of Food and Agriculture

Number Confirmed: 6; 
Number Exposed: 95; 
Comments: No additional cases were confirmed during the quarantine monitoring period. The quarantine period has been fully completed and is officially released.; 
Previous Alerts: 4372, 4362

Seminole County, FL
Outbreak Identifier: 6884
Alert ID: 4393
June 05, 2025
Confirmed Case(s) - Official Quarantine

FDACS Veterinary Medical Officer

Number Confirmed: 1; 
Number Suspected: 4; 
Number Exposed: 30; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 14; Gender: Mare; Onset of Clinical Signs: 4/11/2025; Clinical Signs: Fever, nasal discharge; Confirmation Date: 5/30/2025; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: This is Florida's 22nd case of Strangles for 2025;

Rotavirus
Estrie, QC
Outbreak Identifier: 6883
Alert ID: 4392
June 04, 2025
Confirmed Case(s) - No Quarantine

MAPAQ

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Stable; 
Comments: Foal diarrhea.;

Sonoma County, CA
Outbreak Identifier: 6882
Alert ID: 4391
June 04, 2025
Confirmed Case(s) - Official Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: 36; 
Number Euthanized: 1; 

Horse 1: 
Age: 23; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 6/1/2025; Clinical Signs: ataxia; Confirmation Date: 6/3/2025; Horse Status: Euthanized; 

Comments: A 23-year-old retired Pony mare from Sonoma County displaying neurologic signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The mare was euthanized due to severity of clinical signs. Thirty-six (36) potentially exposed horses at the home premises in Sonoma County were quarantined with enhanced biosecurity measures implemented. CDFA has been onsite and will continue to actively monitor the situation.;