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.

Disease

Outbreak States

Start Date

End Date

West Nile Virus

Orange County, CA

Outbreak Identifier: 5805

Alert ID: 3240

August 25, 2023

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: Unknown;
Age: Yearling; Gender: Colt; Breed: Mustang; Onset of Clinical Signs: 8/19/2023;
Clinical Signs: Ataxia and dysphagia, progressive recumbency, cranial nerve deficits; Confirmation Date: 8/23/2023; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
Comments: This is the 13th 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

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