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

Madera County, CA

Outbreak Identifier: 5849

Alert ID: 3287

September 08, 2023

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/19/2023;
Clinical Signs: Acute hyperesthesia, shaking, intermittently down, mild fever; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;
Comments: This is the 18th 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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