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: 5142

Alert ID: 2510

March 24, 2022

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 3;
Notes: A 14-year-old Quarter Horse mare in Sonoma county displaying neurological signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to equine herpesvirus-1 (EHV-1 neuropathogenic strain) on March 22nd. The horse has been isolated at her home premises since March 15th, and was quarantined along with three (3) additional equids on the property on March 23rd. There is no known epidemiological link to any other current EHM incidents. CDFA was onsite at the premises to conduct a site assessment and assist in implementing enhanced biosecurity measures, including twice daily temperature monitoring. CDFA will continue to closely monitor the situation. For more information about EHM go to: EHM factsheet.;

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