The California Department of Food and Agriculture (CDFA) is providing updates from the current equine herpesvirus type 1 (EHV-1) outbreak in the state. There have been positive horses with just fevers and some neurologic cases (also known as equine herpesvirus myeloencephalopathy or EHM). Below is the latest CDFA update.
NEW: Second EHV-1 Quarantine in San Mateo County
March 9, 2022: A 15-year-old Quarter Horse cross gelding in San Mateo County displaying neurological signs was confirmed positive for equine herpesvirus myeloencephalopathy (EHM) secondary to equine herpesvirus-1 (EHV-1 non-neuropathogenic strain) on necropsy on March 9. The gelding was euthanized due to severity of clinical signs. One additional horse displaying fever only with no neurological signs was confirmed positive for EHV-1. CDFA was onsite and the premises with 52 exposed horses was placed under quarantine. CDFA will closely monitor this situation.
Third EHV-1 Quarantine in Orange County
March 9, 2022:One additional horse on the premises displaying fever was confirmed positive for EHV-1 on March 9. To date, there have been one confirmed EHM case (EHV-1 infection with neurological signs) and six positive EHV-1 fever-only or mild clinical cases associated with this incident. CDFA is actively monitoring the situation.
March 8, 2022:Three additional horses on the premises displaying fever or mild clinical signs were confirmed positive for EHV-1 on March 8th.
Second EHV-1 Quarantine in Orange County
March 8, 2022:Two additional horses on the premises displaying fever or mild clinical signs were confirmed positive for EHV-1 on March 8. To date, there have been two confirmed EHM cases (EHV-1 infection with neurological signs) and 10 positive EHV-1 fever-only or mild clinical cases associated with this incident. CDFA is actively monitoring the situation.
RELEASED: EHV-1 Quarantine in Los Angeles County
March 9, 2022: No additional cases to report. As there were no additional cases for fourteen (14) days on the home premises, the quarantine was released.
EHV-1 Quarantine in Orange County
March 8, 2022: No additional cases or clinical signs have been reported. CDFA continues to monitor the situation.
EHV-1 Quarantine in Riverside County
March 8, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.
EHV-1 Quarantine in San Mateo County
March 8, 2022: One additional horse from the index premises displaying fever only with no neurological signs was confirmed positive for EHV-1 on March 8 and has been isolated at the index premises. Additionally, one previously febrile only EHV-1 positive horse began showing neurological signs. To date, four EHM cases (EHV-1 positive with neurologic signs) and 32 EHV-1 febrile only cases have been confirmed. CDFA continues to actively monitor the situation.
You can find additional information on the California Department of Food and Agriculture (CDFA) website.
