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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 Influenza
Columbia County, WI
Outbreak Identifier: 7466
Alert ID: 5033
June 09, 2026
Confirmed Case(s) - No Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Euthanized: 1; 

Horse 1: 
Age: 20; Gender: Gelding; Breed: Grade; Onset of Clinical Signs: 6/1/2026; Clinical Signs: Fever, urine dribbling; Confirmation Date: 6/5/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Comments: Horse came from a local dealer/kill pen rescue. No other horses on site. Euthanized in part due to presumed chronic neurologic condition.;
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Equine Influenza
Iowa County, WI
Outbreak Identifier: 7464
Alert ID: 5031
June 09, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 9; Gender: Mare; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 6/3/2026; Clinical Signs: high fever, dry cough; Confirmation Date: 6/5/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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Equine Influenza
Dane County, WI
Outbreak Identifier: 7457
Alert ID: 5023
June 02, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 3; Gender: Mare; Breed: Quarter Horse (QH); Confirmation Date: 5/30/2026; Vaccination Status: Status Unknown;
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Equine Influenza, Strangles
Dane County, WI
Outbreak Identifier: 7456
Alert ID: 5022
June 02, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 5; Gender: Gelding; Breed: Miniature Horse; Confirmation Date: 6/1/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: This horse is positive for both equine influenza and strangles;
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Equine Influenza
Polk County, WI
Outbreak Identifier: 7455
Alert ID: 5021
June 02, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 12; Gender: Mare; Breed: Quarter Horse (QH); Confirmation Date: 5/29/2026; Vaccination Status: Vaccinated;
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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 Influenza, Strangles
Sauk County, WI
Outbreak Identifier: 7444
Alert ID: 5009
May 22, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 3; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Gelding; Breed: Miniature Horse; Clinical Signs: Respiratory noise, dried nasal discharge, fever, weight loss, lethargy.; Confirmation Date: 5/21/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: The horse was positive for both influenza and strangles. Horse came from a local dealer/kill pen rescue.
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Equine Influenza
McIntosh County, ND
Outbreak Identifier: 7442
Alert ID: 5007
May 22, 2026
Suspected Case - Voluntary Quarantine

State Veterinarian

Number Confirmed: 2; 
Number Suspected: Unknown; 
Number Exposed: 70; 
Facility Type: Private Facility;
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Equine Influenza
Dane County, WI
Outbreak Identifier: 7439
Alert ID: 5004
May 21, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 5/11/2026; Clinical Signs: Dry cough; Confirmation Date: 5/14/2026; Horse Status: Recovering; Vaccination Status: Undervaccinated;
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Equine Influenza
St. Croix County, WI
Outbreak Identifier: 7414
Alert ID: 4968
April 23, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/21/2026; Confirmation Date: 4/22/2026; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Comments: The horse and owner are based in Wisconsin. The horse has been seen by, and is thought to still be hospitalized at a clinic in Minnesota (just across the border). The horse became ill after attending an event in Minnesota. 
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