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 Diego County, CA

Outbreak Identifier: 6521

Alert ID: 3996

September 30, 2024

Confirmed Case(s) - Official Quarantine

Source: CDFA

Number Confirmed: 1;
Number Exposed: 38;
Facility Type: Training Facility;

Horse 1:
Age: 2; Gender: Filly; Breed: Thoroughbred (TB); Usage: Racing; Onset of Clinical Signs: 9/21/2024; Confirmation Date: 9/24/2024; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: September 27, 2024: A 2-year-old Thoroughbred filly from San Diego County displaying neurologic symptoms was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1) on September 24th. The filly was euthanized due to unresolving neurologic symptoms leading to declining clinical status. Thirty-eight (38) exposed horses at the home premises were quarantined on September 26th with enhanced biosecurity measures implemented. There had been no recent history of travel on or off these premises by the clinical horse and no other horses have been found to have any clinical symptoms. CDFA has been onsite and will continue to actively monitor the situation.;

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