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: 7852

Type: EHV-1

Alert ID: 5424

November 13, 2026

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 50;

Horse 1:
Age: 12; Gender: Gelding; Breed: Warmblood (WB); Clinical Signs: fever, ataxia; Confirmation Date: 11/12/2026; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;

Comments: A 12-year-old Warmblood gelding from San Diego County displaying neurologic signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The gelding is isolated on the home premises and is recovering. Fifty (50) potentially exposed horses at the home premises in San Diego County were quarantined with enhanced biosecurity measures implemented. The EHM horse has had no recent history of travel. Other horses from a different barn on the home premises were at an event, but out of an abundance of caution, they have left the event and are also under quarantine. CDFA has been onsite and will continue to actively monitor the situation.;

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