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

Amador County, CA

Outbreak Identifier: 7679

Alert ID: 5254

September 17, 2026

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;

Horse 1:
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Clinical Signs: ataxia, dull mentation, fever, falling to knees; Confirmation Date: 9/17/2026; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;

Comments: The fourteenth (14th) equine case of West Nile Virus in California in 2026 was confirmed in Amador County. On September 17, 2026, a 5-year-old vaccinated Quarter Horse gelding in Amador County displaying neurologic signs was confirmed positive for West Nile Virus. The gelding is alive and recovering.;

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