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

Orange, Los Angeles, San Mateo, Riverside, Ventura, CA

Outbreak Identifier: 5100

Alert ID: 2454

March 04, 2022

Outbreak Update

Source: California Department of Food and Agriculture

Notes: Below is a summary of cases currently in California:

-Orange County #1 (original alert ID #2438): 19 confirmed (1 EHM, 18 fever)
-Orange County #2 (a new premises): 8 confirmed (2 EHM, 6 fever/mild signs)
- Los Angeles County (original alert ID#2439): 1 confirmed (1 EHM)
- San Mateo County (original alert ID #2405): 31 confirmed (3 EHM, 28 fevers)
- Riverside County (original alert ID#2416): 30 confirmed (3 EHM, 27 fevers)

All premises confirmed to have horses with EHM are under official quarantine.

Horses in Sonoma, Santa Barbara, and Ventura counties that were at the original outbreak premises in Riverside county have been confirmed positive for non-neurologic EHV-1 and are isolated on their home premises.;

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