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National Equine Health Stakeholder Call-August 2026
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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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West Nile Virus
Duchesne County, UT
Outbreak Identifier: 7587
Alert ID: 5160
August 21, 2026
Confirmed Case(s) - No Quarantine

Utah Department of Agriculture and Food

Number Confirmed: 1; 
Number Exposed: 5; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 1; Gender: Filly; Breed: Quarter Horse (QH); Usage: Roping; Onset of Clinical Signs: 8/15/2026; Clinical Signs: 8/15/26 property owner noted her to be down in the evening 8/16/26 veterinary assessment. sensation in hind limbs, but too weak to stand; Confirmation Date: 8/20/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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West Nile Virus
Cache County, UT
Outbreak Identifier: 7586
Alert ID: 5159
August 21, 2026
Suspected Case - No Quarantine

Utah Department of Agriculture and Food

Number Suspected: 1; 
Number Exposed: 2; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Ranch Horse; Onset of Clinical Signs: 8/9/2026; Clinical Signs: Property owner noted them down on 8/9/2026 pm 8/10/26 AM vet visited and cound not get to stand. Euthanized; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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West Nile Virus
Fremont County, WY
Outbreak Identifier: 7585
Alert ID: 5158
August 21, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1;
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Equine Influenza
Unknown County, MI
Outbreak Identifier: 7584
Alert ID: 5157
August 21, 2026
Confirmed Case(s) - No Quarantine

Michigan Department of Agriculture

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

Horse 1: 
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Clinical Signs: Lethargy, nasal discharge, fever; Confirmation Date: 8/20/2026; Vaccination Status: Vaccinated;
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Strangles
King County, WA
Outbreak Identifier: 7583
Alert ID: 5156
August 21, 2026
Confirmed Case(s) - No Quarantine

Asst State Veterinarian-WSDA

Number Confirmed: 1; 
Number Suspected: 8; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Facility is under self imposed quarantine and under veterinary care.;
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Pigeon Fever
Albany County, WY
Outbreak Identifier: 7576
Alert ID: 5155
August 20, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 2; 
Number Exposed: 8; 
Facility Type: Private Facility; 
Previous Alerts: 5148
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West Nile Virus
Fremont County, WY
Outbreak Identifier: 7582
Alert ID: 5154
August 20, 2026
Confirmed Case(s) - No Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Euthanized: 1;
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Strangles
St Clair County, MI
Outbreak Identifier: 7581
Alert ID: 5153
August 20, 2026
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture

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

Horse 1: 
Age: 22; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/16/2026; Clinical Signs: coughing, depression, increased respiration rate; Confirmation Date: 8/18/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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West Nile Virus
Sioux County, ND
Outbreak Identifier: 7580
Alert ID: 5152
August 20, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Farm;
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West Nile Virus
East Baton Rouge, LA
Outbreak Identifier: 7579
Alert ID: 5151
August 20, 2026
Confirmed Case(s) - No Quarantine

University Veterinary Hospital

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: University Veterinary Hospital; 

Horse 1: 
Age: 1; Gender: Colt; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/12/2026; Clinical Signs: Ataxia, spasticity, somnolent, fasciculations; Confirmation Date: 8/14/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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