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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.



West Nile Virus
Placer County, CA
Outbreak Identifier: 6326
Alert ID: 3804
July 26, 2024
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 6; Gender: Stallion; Breed: Andalusian Cross; Onset of Clinical Signs: 7/17/2024; Clinical Signs: ataxia, muscle fasciculations in muzzle, grinding teeth, decreased appetite; Confirmation Date: 7/25/2024; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: The first (1st) case of West Nile Virus in California in 2024 was confirmed in Placer County. On July 25, 2024, a 6-year-old Andalusian cross stallion in Placer County with an unknown vaccine history displaying neurologic signs was confirmed positive for West Nile Virus. The stallion is alive and recovering.;