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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
Crook County, OR
Outbreak Identifier: 7530
Alert ID: 5101
July 31, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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Strangles
Clackamas County, OR
Outbreak Identifier: 7529
Alert ID: 5100
July 31, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Kings County, CA
Outbreak Identifier: 7528
Alert ID: 5099
July 31, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Euthanized: 1; 

Horse 1: 
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/26/2026; Clinical Signs: hind end ataxia, hypersensitivity, recumbency; Confirmation Date: 7/31/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Comments: The third (3rd) equine case of West Nile Virus in California in 2026 was confirmed in Kings County. On July 31, 2026, an 8-year-old Quarter Horse gelding in Kings County with unknown vaccine history displaying neurologic signs was confirmed positive for West Nile Virus. The gelding was euthanized due to severity of clinical signs.;
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West Nile Virus
Ware County, GA
Outbreak Identifier: 7527
Alert ID: 5098
July 31, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Comments: The Georgia Department of Agriculture has confirmed a WNV case in Ware County. The 2026 total reported WNV cases in Georgia to date is 1 confirmed.;
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West Nile Virus
Ware County, GA
Outbreak Identifier: 7526
Alert ID: 5097
July 31, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 2; 
Comments: The Georgia Department of Agriculture has confirmed a WNV case in Ware County. The 2026 total reported WNV cases in Georgia to date is 2 confirmed.;
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West Nile Virus
San Joacquin County, CA
Outbreak Identifier: 7525
Alert ID: 5096
July 29, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Euthanized: 1; 

Horse 1: 
Age: 6; Gender: Stallion; Breed: Andalusian; Onset of Clinical Signs: 7/22/2026; Clinical Signs: fever, grade 4 ataxia, muscle fasciculations; Confirmation Date: 7/29/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: The second (2nd) case of West Nile Virus in California in 2026 was confirmed in San Joaquin County. On July 29, 2026, an unvaccinated 6-year-old Andalusian stallion in San Joaquin County displaying neurologic signs was confirmed positive for West Nile Virus. The stallion was euthanized due to severity of clinical signs.
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Strangles
Alger County, MI
Outbreak Identifier: 7524
Alert ID: 5095
July 29, 2026
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 12; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/13/2026; Clinical Signs: Lethargy, fever, nasal discharge, anorexia, ocular discharge; Confirmation Date: 7/15/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;
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Equine Infectious Anemia
Benton County, MN
Outbreak Identifier: 7523
Alert ID: 5094
July 29, 2026
Confirmed Case(s) - Official Quarantine

State Animal Health Official

Number Confirmed: 1; 
Number Exposed: 63; 
Facility Type: Private Facility; 

Horse 1: 
Age: 28; Gender: Mare; Breed: Haflinger; Usage: Trail Riding; Clinical Signs: none; Horse Status: Quarantined; 

Comments: Horse was bought from riding camp herd dispersal in February with no previous Coggins test history. The new owner tested during routine spring vaccine visit. Disease trace investigation is in progress.;
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Potomac Horse Fever
Green County, WI
Outbreak Identifier: 7522
Alert ID: 5093
July 29, 2026
Confirmed Case(s) - No Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 2; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 14; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/22/2026; Clinical Signs: watery diarrhea/fever; Confirmation Date: 7/24/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

Horse 2: 
Age: 20; Gender: Gelding; Breed: Thoroughbred (TB); Onset of Clinical Signs: 7/22/2026; Clinical Signs: lethargy, fever, dehydration, (later) diarrhea; Confirmation Date: 7/24/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;
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Strangles
Portage County, WI
Outbreak Identifier: 7521
Alert ID: 5092
July 29, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 2; Gender: Mare; Breed: Friesian; Onset of Clinical Signs: 6/18/2026; Clinical Signs: Submandibular abscess; Confirmation Date: 6/22/2026; Horse Status: Recovering; Vaccination Status: Status Unknown;
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