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

San Luis Obispo County, CA

Outbreak Identifier: 5347

Alert ID: 2729

September 15, 2022

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Age: 15; Gender: Stallion; Breed: Warmblood (WB); Onset of Clinical Signs: 9/9/2022;
Clinical Signs: ataxia (all 4), hypermetric in front limbs, muscle fasciculations, hypersensitive on left side, fever 103.2; Confirmation Date: 9/14/2022; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
Comments: On September 14, 2022, a 15-year-old unvaccinated Warmblood stallion attending an event in San Luis Obispo County, displaying acute neurological signs, was confirmed positive for West Nile Virus. He was imported from Mexico within one week of onset of clinical signs so exposure was likely in Mexico. The stallion is alive and recovering. This is the eighth case of equine WNV confirmed in California in 2022. For more information about West Nile Virus go to: WNV factsheet.

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