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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.



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Equine Herpesvirus- Neurologic
Orange County, CA
Outbreak Identifier: 5101
Alert ID: 2502
March 18, 2022
Quarantine Released

California Department of Food and Agriculture

  • Orange county #1 (original EDCC notification #2438): 23 confirmed (2 EHM, 21 fever)- No Change
  • Orange county #2 (not posted individually): 16 confirmed (2 EHM, 14 fever/mild signs)- No Change
  • Orange county #3 (original EDCC notification #2455): 26 confirmed (2 EHM, 24 fevers)  Update 2/17/2022: Two (2) additional horses on the premises displaying fever or mild clinical signs only were confirmed positive for EHV-1 on March 17th. To date, there have been two (2) confirmed EHM cases (EHV-1 infection with neurological signs) and twenty-four (24) positive EHV-1 fever-only or mild clinical cases associated with this incident. CDFA is actively monitoring the situation.;
  • San Mateo county #1 (original EDCC notification #2405): 40 confirmed (4 EHM, 36 fevers)
  • San Mateo county #2 (original EDCC notification #2479): 3 confirmed (1 EHM, 2 fever)- No Change
  • Riverside county (original EDCC notification #2416): 35 confirmed (3 EHM, 32 fevers)-No Change
  • Santa Clara county (original EDCC notification #2482): 2 confirmed (2 EHM)- No Change

 
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