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

San Diego County, CA

Outbreak Identifier: 5153

Alert ID: 2520

March 30, 2022

Quarantine Released

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Suspected: 1;
Age: 32; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 3/21/2022;
Clinical Signs: Neuro (down, hind end ataxia); Confirmation Date: 3/29/2022; Horse Status: Euthanized;
Notes: A 32-year-old Warmblood mare in San Diego county displaying neurological signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to equine herpesvirus-1 (EHV-1 non-neuropathogenic strain) on March 29th. The mare was euthanized on March 21st due to severity of clinical signs. CDFA was onsite and the premises with 102 exposed horses were placed under quarantine on March 30th. CDFA will continue to closely monitor the situation. For more information about EHM go to: EHM factsheet.

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