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

Merced County, CA

Outbreak Identifier: 5302

Alert ID: 2682

August 11, 2022

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 28;
Facility Type: Private Facility;
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/8/2022;
Clinical Signs: fever, ataxia, trouble urinating; Confirmation Date: 8/10/2022; Horse Status: Affected And Alive;
Comments: A 8-year-old Quarter Horse gelding originating in Merced county displaying respiratory and neurological signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (NEHV-1, neuropathogenic strain) on August 10th. The gelding is currently quarantined in isolation under veterinary care at an offsite hospital. Twenty-eight (28) potentially exposed horses on the home premises were quarantined on August 11th. Neither the index horse nor any horses on the property have had any recent show or travel history. CDFA will assist the home premises in conducting a site assessment and implementing enhanced biosecurity measures, including twice daily temperature monitoring. For more information about EHM go to: EHM factsheet.

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