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

Sacramento County, CA

Outbreak Identifier: 7525

Alert ID: 5096

July 29, 2026

Confirmed Case(s) - No Quarantine

Source: 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 Sacramento County. On July 29, 2026, an unvaccinated 6-year-old Andalusian stallion in Sacramento 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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