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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.



Equine Herpesvirus- Respiratory
Beaverhead County, MT
Outbreak Identifier: 7167
Alert ID: 4691
October 31, 2025
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 5; 
Number Suspected: 10; 
Number Exposed: 75;

Comments: This is the same location as Alert ID 4692. Four horses are dually infected with Equine Influenza.
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Equine Herpesvirus- Respiratory
Waupaca County, WI
Outbreak Identifier: 7144
Alert ID: 4667
October 17, 2025
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 25; 

Horse 1: 
Age: 4; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: Coughing, nasal discharge, lethargy, fever; Confirmation Date: 10/15/2025; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;
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Equine Herpesvirus- Respiratory
Sacramento County, CA
Outbreak Identifier: 7011
Alert ID: 4528
August 27, 2025
Confirmed Case(s) - No Quarantine

Attending Veterinarian

Number Confirmed: 2; 
Number Suspected: 2; 
Number Exposed: 10;
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