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 Barbara County, CA

Outbreak Identifier: 7351

Alert ID: 4898

March 02, 2026

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 3;
Number Euthanized: 1;

Horse 1:
Age: 16; Gender: Gelding; Breed: Tennessee Walking Horses; Clinical Signs: ataxia, trouble urinating, recumbent; Confirmation Date: 3/2/2026; Horse Status: Euthanized;

Comments: A 16-year-old Tennessee Walker gelding from Santa Barbara County displaying neurologic signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The gelding was euthanized due to severity of clinical signs. Three (3) potentially exposed horses at the home premises in Santa Barbara County were quarantined with enhanced biosecurity measures implemented. There has been no history of horses on or off the property in more than 30 days. CDFA has been onsite and will continue to actively monitor the situation.;

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