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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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Strangles
Lane County, OR
Outbreak Identifier: 7445
Alert ID: 5010
May 23, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: Unknown;
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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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Strangles
Clackamas County, OR
Outbreak Identifier: 7443
Alert ID: 5008
May 22, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 2;
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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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Strangles
Racine County, WI
Outbreak Identifier: 7441
Alert ID: 5006
May 21, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 16; Gender: Gelding; Breed: Grade; Onset of Clinical Signs: 4/28/2026; Clinical Signs: Mucopurulent bilateral nasal discharge, lethargy; Confirmation Date: 5/1/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: Two clinical horses came from a WI dealer selling rescue horses. One was sampled.;
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Strangles
Clark County, WI
Outbreak Identifier: 7440
Alert ID: 5005
May 21, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 3; Gender: Gelding; Breed: Belgian; Usage: Pulling; Onset of Clinical Signs: 5/13/2026; Clinical Signs: febrile, nasal discharge, mandibular lymphadenopathy; Confirmation Date: 5/18/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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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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Strangles
Crook County, OR
Outbreak Identifier: 7438
Alert ID: 5003
May 18, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 2; 
Number Exposed: 30;
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Strangles
Marion County, OR
Outbreak Identifier: 7437
Alert ID: 5002
May 13, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Veterinary Hospital;
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Strangles
Grey County, ON
Outbreak Identifier: 7436
Alert ID: 5001
May 12, 2026
Confirmed Case(s) - Voluntary Quarantine

OMAFA

Number Confirmed: 1; 
Number Suspected: 4; 
Number Exposed: 1; 
Facility Type: Farm; 

Horse 1: 
Age: 1; Gender: Filly; Breed: Gypsy Vanner; Clinical Signs: This filly developed Strangles ( multiple draining abscesses, persistent fever, weight loss) and died after another horse on the property returned from a 90-day training session at a large training facility which recently had Strangles (see Alert ID 4920). 5 of the 6 horses on this private farm developed Strangles. One senior pony is receiving supportive treatment by the attending veterinarian.; Confirmation Date: 5/8/2026; Horse Status: Deceased; 

Comments: Two outbreaks in 2025 (Alert ID 4302 and 4304) are also epidemiologically linked to the facility in Alert ID 4920. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;
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