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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
Washington County, TN
Outbreak Identifier: 7790
Alert ID: 5366
October 21, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
East Tennessee County, TN
Outbreak Identifier: 7774
Alert ID: 5350
October 19, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Glades County, FL
Outbreak Identifier: 7759
Alert ID: 5335
October 19, 2026
Confirmed Case(s) - No Quarantine

Florida Department of Agriculture and Consumer Services

Number Confirmed: 1; 
Number Exposed: Unknown; 
Comments: This is the 3rd confirmed case of WNV for Florida in 2026.;
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West Nile Virus
Knox County, TN
Outbreak Identifier: 7756
Alert ID: 5332
October 16, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Sacramento County, CA
Outbreak Identifier: 7752
Alert ID: 5328
October 15, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 

Horse 1: 
Age: Yearling; Gender: Filly; Breed: Paint; Onset of Clinical Signs: 10/7/2026; Clinical Signs: Muscle fasciculations, hypersensitivity, muscle atrophy, ataxia; Confirmation Date: 10/14/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: The seventeenth (17th) equine case of West Nile Virus in California in 2026 was confirmed in Sacramento County. On October 14, 2026, an unvaccinated 10-month-old Paint filly in Sacramento County displaying neurologic signs was confirmed positive for West Nile Virus. The filly is alive and recovering.;
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West Nile Virus
Siskiyou County, CA
Outbreak Identifier: 7747
Alert ID: 5323
October 14, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 

Horse 1: 
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 10/4/2026; Clinical Signs: acute ataxia (all 4 limbs); Confirmation Date: 10/8/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: The sixteenth (16th) equine case of West Nile Virus in California in 2026 was confirmed in Siskiyou County. On October 8, 2026, a 8-year-old Quarter Horse gelding with an unknown vaccine history in Siskiyou County displaying neurologic signs was confirmed positive for West Nile Virus. The gelding is alive and recovering.;
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West Nile Virus
Washington County, TN
Outbreak Identifier: 7746
Alert ID: 5322
October 14, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Knox County, TN
Outbreak Identifier: 7745
Alert ID: 5321
October 14, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Townsend County, TN
Outbreak Identifier: 7740
Alert ID: 5316
October 13, 2026
Confirmed Case(s) - No Quarantine

Attending veterinarian

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

Horse 1: 
Age: 9; Gender: Mare; Breed: Rocky Mountain Horse; Onset of Clinical Signs: 10/6/2026; Clinical Signs: Recumbency and unable to rise on her own, able to stand with assistance. Fasciculations and tremors around head, muzzle, limbs.; Confirmation Date: 10/13/2026; Horse Status: Recovering; Vaccination Status: Undervaccinated;
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West Nile Virus
Shasta County, CA
Outbreak Identifier: 7736
Alert ID: 5312
October 09, 2026
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 

Horse 1: 
Age: 7; Gender: Mare; Breed: Andalusian; Onset of Clinical Signs: 9/26/2026; Clinical Signs: hypersensitivity, proprioceptive deficits in hind end; Confirmation Date: 10/6/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: The fifteenth (15th) equine case of West Nile Virus in California in 2026 was confirmed in Shasta County. On October 6, 2026, an unvaccinated 7-year-old Andalusian mare in Shasta County displaying neurologic signs was confirmed positive for West Nile Virus. The mare is alive and recovering.;
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