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.

Disease

Outbreak States

Start Date

End Date

Equine Herpesvirus- Neurologic

San Bernardino County, CA

Outbreak Identifier: 6723

Alert ID: 4209

February 01, 2025

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 2;
Number Exposed: 35;
Number Euthanized: 1;

Horse 1:
Age: 26; Gender: Mare; Breed: Paint; Horse Status: Euthanized;

Horse 2:
Age: 16; Gender: Gelding; Breed: Paint; Horse Status: Affected And Alive;

Comments: A 26-year-old Paint mare and a 16-year-old Paint gelding from San Bernardino County displaying neurologic signs were confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The mare was euthanized due to severity of clinical signs and the gelding is alive and under supportive care at the home premises. Thirty-five (35) potentially exposed horses at the home premise in San Bernardino County were quarantined with enhanced biosecurity measures implemented. This premises shares a fence line with the other EHM quarantined premises. There has been no recent history of travel on or off these premises by the clinical horses. CDFA has been onsite and will continue to actively monitor the situation.;

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