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

Alameda County, CA

Outbreak Identifier: 5085

Alert ID: 2429

February 18, 2022

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 21;
Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 2/10/2022;
Clinical Signs: ataxia; Confirmation Date: 2/17/2022; Horse Status: Affected And Alive;
Notes: An adult Warmblood gelding in Alameda county displaying neurological signs on February 11th was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to equine herpesvirus-1 (EHV-1 neuropathogenic strain) on February 17th. The horse was afebrile and isolated at his home premises, and was quarantined along with twenty-one (21) additional equids on the property. There has been no movement of horses on or off the property in the past 14 days. 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 go to EHM factsheet.

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