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

Los Angeles County, CA

Outbreak Identifier: 7792

Type: EHV-1

Alert ID: 5368

October 23, 2026

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 37;

Horse 1:
Age: 18; Gender: Gelding; Breed: Thoroughbred (TB); Clinical Signs: ataxia; Horse Status: Affected And Alive;

Comments: An 18-year-old Thoroughbred gelding from Los Angeles 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. Thirty-seven (37) potentially exposed horses at the home premises in Los Angeles County were quarantined with enhanced biosecurity measures implemented. CDFA has been onsite and will continue to actively monitor the situation.;

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