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

Sonoma County, CA

Outbreak Identifier: 4622

Alert ID: 1996

March 16, 2021

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 21;
Facility Type: Boarding Facility;
Age: 21; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 3/13/2021; Clinical Signs: Ataxia, Urine Dribbling, ataxia all four limbs; Confirmation Date: 3/15/2021; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
Notes: A 21-year-old Warmblood mare from Sonoma County displaying neurological signs was confirmed positive for Equine Herpesvirus-1. The horse is alive and is being treated in isolation at a veterinary hospital. Horses on the home premises have been quarantined with enhanced biosecurity measures and twice daily temperature monitoring. There is no known risk of exposure out of this facility to any local events. The clinical horse has no recent travel history and no links to any other EHV-1 cases. CDFA will continue to actively monitor exposed horses.

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