Outbreaks | Equine Disease Communication Center

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

Sutter County, CA

Outbreak Identifier: 7636

Alert ID: 5211

September 05, 2026

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;

Horse 1:
Age: 10; Gender: Gelding; Breed: Paint; Onset of Clinical Signs: 8/28/2026; Clinical Signs: ataxia, muscle fasciculations, hypermetric, hypersensitivity; Confirmation Date: 9/3/2026; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;

Comments: The tenth (10th) equine case of West Nile Virus in California in 2026 was confirmed in Sutter County. On September 3, 2026, a 10-year-old vaccinated Paint gelding in Sutter County displaying neurologic signs was confirmed positive for West Nile Virus. The gelding is alive and recovering. The gelding currently resides in Contra Costa County but was exposed in Sutter County.;

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