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

Santa Clara County, CA

Outbreak Identifier: 5767

Alert ID: 3202

August 21, 2023

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 5; Gender: Mare; Breed: Lusitano; Onset of Clinical Signs: 7/29/2023;
Clinical Signs: Recumbency, weak pelvic limbs, muscle twitching, CNS signs, ataxic all four limbs, weakness in thoracic limbs, recumbent and unable to rise without assistance; Confirmation Date: 8/17/2023; Horse Status: Recovering; Vaccination Status: Vaccinated;
Comments: This is the 7th case of WNV confirmed in CA in 2023.

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