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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
Yuba County, CA
Outbreak Identifier: 6327
Alert ID: 3806
July 29, 2024
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: Unknown; 
Number Euthanized: 1; 

Horse 1: 
Age: 16; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/17/2024; Clinical Signs: ataxia, muscle fasciculations, facial asymmetry, febrile; Confirmation Date: 7/25/2024; Horse Status: Euthanized; Vaccination Status: Undervaccinated;

Comments: The second (2nd) case of West Nile Virus in California in 2024 was confirmed in Yuba County. On July 25, 2024, a 16-year-old undervaccinated Quarter Horse gelding in Yuba County displaying neurologic signs was confirmed positive for West Nile Virus. The gelding was euthanized due to severity of clinical signs.;
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