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Disease Alerts

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.



Los Angeles County, CA
Outbreak Identifier: 6858
Alert ID: 4372
May 21, 2025
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 6; 
Number Exposed: 95; 

Horse 1: 
Age: 3; Gender: Gelding; Clinical Signs: fever; 

Horse 2: 
Age: 20; Gender: Mare; Clinical Signs: fever; 

Horse 3: 
Age: 21; Gender: Mare; Breed: Warmblood (WB); Clinical Signs: fever; 

Horse 4: 
Age: 24; Gender: Gelding; Breed: Quarter Horse (QH); Clinical Signs: fever; 

Comments: Four (4) additional horses at the home premises with fevers were confirmed positive for Equine Herpesvirus-1 (EHV-1). CDFA continues to monitor the situation.; 
Previous Alerts: 4362