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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Equine Herpesvirus- Neurologic

Santa Clara County, CA

Outbreak Identifier: 5121

Alert ID: 2482

March 11, 2022

Outbreak Update

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 168;
Age: 18; Gender: Gelding; Breed: Percheron/Thoroughbred cross; Onset of Clinical Signs: 3/7/2022;
Clinical Signs: Fever, neurologic; Confirmation Date: 3/9/2022; Horse Status: Euthanized;
Notes: An 18-year-old Thoroughbred/Percheron cross gelding in Santa Clara county displaying neurological signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to equine herpesvirus-1 (EHV-1 non-neuropathogenic strain). The gelding was euthanized due to severity of clinical signs. CDFA was onsite and the premises with 168 exposed horses were placed under quarantine. CDFA will closely monitor this situation. For more information about EHM go to: EHM factsheet.

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