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.

Disease

Outbreak States

Start Date

End Date

Equine Herpesvirus- Neurologic

Alameda County, CA

Outbreak Identifier: 6793

Alert ID: 4298

April 08, 2025

Outbreak Update

Source: California Department of Food and Agriculture

Number Confirmed: 2;
Number Exposed: 75;

Horse 1:
Age: 18; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/5/2025; Clinical Signs: fever; Confirmation Date: 4/7/2025; Horse Status: Affected And Alive;

Comments: An additional horse from the home premises, an 18-year-old Quarter Horse mare with a fever was confirmed positive for Equine Herpesvirus-1 (EHV-1). The mare is alive and under supportive care at an off-site veterinary hospital. CDFA continues to actively monitor the situation.;
Previous Alerts: 4289

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