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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.



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Siskiyou County, CA
Outbreak Identifier: 5930
Alert ID: 3371
September 29, 2023
Confirmed Case(s) - No Quarantine

California Department of Food & Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Age: 23; Gender: Mare; Breed: Quarter Horse (QH); 
Clinical Signs: ataxia, tachycardia, lip fasciculations; Confirmation Date: 9/20/2023; Vaccination Status: Status Unknown;
Comments: This is the 25th case of equine WNV confirmed in CA in 2023. For more information, go to: https://www.cdfa.ca.gov/ahfss/Animal_Health/WNV_Info.html