California EHV-1 Update March 10, 2022

The equine herpesvirus type 1 (EHV-1) outbreak in California continues to spread, with some horses experiencing neurologic issues.

The CDFA provided this map of the current EHV-1 outbreak. CDFA

The California Department of Food and Agriculture (CDFA) has updated information for the current equine herpesvirus type 1 (EHV-1) outbreak.

NEW: EHV-1 Quarantine in Santa Clara County

March 10, 2022: An 18-year-old Thoroughbred/Percheron cross gelding in Santa Clara county displaying neurological signs was confirmed positive for equine herpesvirus myeloencephalopathy (EHM) secondary to infection with equine herpesvirus type 1 (EHV-1 non-neuropathogenic strain). The gelding was euthanized due to severity of clinical signs. CDFA was onsite and the premises with 168 exposed horses were placed under quarantine. CDFA will closely monitor this situation.

Third EHV-1 Quarantine in Orange County

March 10, 2022: Three additional horses on the premises displaying fever were confirmed positive for EHV-1 on March 10. To date, there have been one confirmed EHM case (EHV-1 infection with neurological signs) and nine positive EHV-1 fever-only or mild clinical cases associated with this incident. CDFA is actively monitoring the situation.

EHV-1 Quarantine in Orange County

March 10, 2022: One additional horse on the premises displaying fever or mild clinical signs was confirmed positive for EHV-1 on March 10. To date, there have been two confirmed EHM cases (EHV-1 infection with neurological signs) and 21 positive EHV-1 fever-only cases associated with this incident. CDFA is actively monitoring the situation.

EHV-1 Quarantine in Riverside County

March 10, 2022: One additional horse on the index event premise, outside of the index quarantine barn, displaying fever only with no neurologic signs was confirmed positive for EHV-1. To date, there have been three confirmed EHM cases (EHV-1 infection with neurological signs) and 32 confirmed EHV-1 fever-only cases associated with this incident. CDFA is actively monitoring the situation.

You can see the CDFA March 9 update here.

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