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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.



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Equine Herpesvirus- Respiratory
Crook County, OR
Outbreak Identifier: 7480
Type: EHV-1
Alert ID: 5047
June 23, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 1;
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Equine Herpesvirus- Respiratory
Yamhill County, OR
Outbreak Identifier: 7453
Type: EHV-1
Alert ID: 5018
May 30, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 4;
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Equine Herpesvirus- Respiratory, Strangles
Adams County, WI
Outbreak Identifier: 7452
Type: EHV-4
Alert ID: 5017
May 29, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 18; Gender: Mare; Breed: Quarter Horse Cross; Onset of Clinical Signs: 5/20/2026; Clinical Signs: Lymphadenopathy; Confirmation Date: 5/22/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;
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Equine Herpesvirus- Respiratory, Equine Influenza
Polk County, WI
Outbreak Identifier: 7451
Type: EHV-1
Alert ID: 5016
May 28, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 1; 

Horse 1: 
Age: 3; Gender: Mare; Breed: Grade; Onset of Clinical Signs: 5/25/2026; Clinical Signs: Fever, cough; Confirmation Date: 5/28/2026; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Comments: This horse is positive for Equine Influenza, EHV-1 Respiratory, and EHV-4 Respiratory. 
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Equine Herpesvirus- Respiratory
Lewis County, WA
Outbreak Identifier: 7446
Type: EHV-1
Alert ID: 5011
May 26, 2026
Confirmed Case(s) - Voluntary Quarantine

Asst State Veterinarian-WSDA

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Delayed reporting. Horse was under vet care and managed.;
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