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

Riverside County, CA

Outbreak Identifier: 5550

Alert ID: 2947

April 04, 2023

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 36;
Age: 18; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 3/27/2023;
Clinical Signs: progressive hind end ataxia, inability to urinate, recumbent; Confirmation Date: 4/4/2023; Horse Status: Euthanized;
Comments: A 18-year-old Warmblood gelding in Riverside County displaying neurologic signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1, non-neuropathogenic strain) on April 4th. The gelding was euthanized due to severity of clinical signs. The index case and its cohort had no recent show or travel history in the past thirty (30) days. There is no known epidemiological link between this case and the previously confirmed active EHM incident in Riverside County. CDFA was onsite at the index premises in Riverside County, and thirty-six (36) additional horses were quarantined with enhanced biosecurity measures implemented. For more information go to https://www.equinediseasecc.org/equine-herpesvirus.

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