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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
Jewell County, KS
Outbreak Identifier: 7569
Alert ID: 5141
August 17, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Rawlins County, KS
Outbreak Identifier: 7568
Alert ID: 5140
August 17, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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Strangles
Sonoma County, CA
Outbreak Identifier: 7567
Alert ID: 5139
August 17, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending veterinarian

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 30; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 25; Gender: Mare; Breed: Thoroughbred (TB); Usage: Therapy; Onset of Clinical Signs: 8/7/2026; Clinical Signs: cough; Confirmation Date: 8/13/2026; Horse Status: Isolated;
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West Nile Virus
Fresno County, CA
Outbreak Identifier: 7566
Alert ID: 5138
August 17, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 

Horse 1: 
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/3/2026; Clinical Signs: hind end ataxia, muscle fasciculations; Confirmation Date: 8/14/2026; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Comments: The sixth (6th) equine case of West Nile Virus in California in 2026 was confirmed in Fresno County. On August 14, 2026, an undervaccinated 5-year-old Quarter Horse mare in Fresno County displaying neurologic signs was confirmed positive for West Nile Virus. The mare is alive and recovering.;
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West Nile Virus
Union County, OR
Outbreak Identifier: 7565
Alert ID: 5137
August 14, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: Unknown; 
Comments: Unvaccinated horse (laboratory confirmed 8/11/2026);
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West Nile Virus
Benton County, WA
Outbreak Identifier: 7564
Alert ID: 5136
August 14, 2026
Confirmed Case(s) - No Quarantine

Asst State Veterinarian-WSDA

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Horse was 2 yrs old and unvaccinated;
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West Nile Virus
Todd County, MN
Outbreak Identifier: 7563
Alert ID: 5135
August 14, 2026
Confirmed Case(s) - No Quarantine

State Animal Health Official

Number Confirmed: 1; 
Number Exposed: 15; 
Facility Type: Farm; 

Horse 1: 
Age: 6; Gender: Gelding; Breed: Standardbred; Usage: Carriage; Onset of Clinical Signs: 8/3/2026; Clinical Signs: Lethargy, ataxia worse in hind limbs than forelimbs.; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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Strangles
Waupaca County, WI
Outbreak Identifier: 7562
Alert ID: 5134
August 13, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 4; 

Horse 1: 
Age: 23; Gender: Gelding; Breed: Paint; Clinical Signs: Nasal discharge, cough; Confirmation Date: 8/11/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: Affected horses were acquired from auction;
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West Nile Virus
Utah County, UT
Outbreak Identifier: 7561
Alert ID: 5133
August 13, 2026
Confirmed Case(s) - No Quarantine

Utah Department of Agriculture and Food

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

Horse 1: 
Age: 16; Gender: Mare; Breed: Quarter Horse (QH); Usage: Ranch Horse; Onset of Clinical Signs: 8/8/2026; Clinical Signs: 8/8/26: ataxia and no muscle fasciculations 8/12/26: down and euthanized; Confirmation Date: 8/12/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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West Nile Virus
Morgan County, UT
Outbreak Identifier: 7560
Alert ID: 5132
August 13, 2026
Confirmed Case(s) - No Quarantine

Utah Department of Agriculture and Food

Number Confirmed: 1; 
Number Exposed: 9; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Filly; Breed: Quarter Horse (QH); Usage: Breeding; Onset of Clinical Signs: 8/9/2026; Clinical Signs: 8/9/26: severe colic signs (down and rolling) 8/10/26: 3/4 ataxia on all 4 limbs 8/12/26: recovering; Confirmation Date: 8/13/2026; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Comments: Vaccinated and boostered 1 m later, but not this spring.;
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