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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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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;

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;

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. 

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.;

Douglas County, NE
Outbreak Identifier: 7425
Type: EHV-1
Alert ID: 4989
May 06, 2026
Confirmed Case(s) - No Quarantine

Attending Veterinarian

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

Horse 1: 
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Sales; Onset of Clinical Signs: 4/6/2026; Clinical Signs: Bought at sale about a month ago, has had a cough and snotty nose, started to develop swelling in limbs, sheath and odd spots on body. All four limbs stocked up and swollen up into forearms, petechiae inside muzzle and gums, not able to take temp, safe access in trailer is questionable; Confirmation Date: 5/6/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Purchased at a sale in Iowa, transported to Nebraska.;

Sauk County, WI
Outbreak Identifier: 7398
Type: EHV-4
Alert ID: 4950
April 11, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 5; Gender: Mare; Breed: Morgan; Onset of Clinical Signs: 4/7/2026; Clinical Signs: Mucoid nasal discharge, occasional cough, lymphadenopathy, fever, decreased appetite; Confirmation Date: 4/9/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

Comments: Also, PCR positive for EHV-4 and ERBV;

Washington County, NE
Outbreak Identifier: 7392
Type: EHV-4
Alert ID: 4944
April 09, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 10;