California Equine Herpesvirus Update Through March 30, 2022

The California Department of Food and Agriculture (CDFA) continues to monitor and provide information on the outbreak of equine herpesvirus type 1 (EHV-1).

This map is provided by the California Department of Food and Agriculture (CDFA). CDFA

The California Department of Food and Agriculture (CDFA) continues to monitor and provide information on the outbreak of equine herpesvirus type 1 (EHV-1). There have been respiratory and neurologic cases associated with this outbreak in multiple counties. 

NEW: EHV-1 Quarantine in San Diego County

March 30, 2022: A 32-year-old Warmblood mare in San Diego County displaying neurological signs was confirmed positive for equine herpesvirus myeloencephalopathy (EHM) secondary to equine herpesvirus type 1 infection (EHV-1 non-neuropathogenic strain) on March 29. The mare had been euthanized on March 21 due to severity of clinical signs. CDFA was onsite, and the premises with 102 exposed horses was placed under quarantine on March 30. CDFA will continue to closely monitor the situation.

EHV-1 Quarantine in Sonoma County

March 30, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

EHV-1 Quarantine in Santa Clara County

March 30, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

RELEASED: Second EHV-1 Quarantine in San Mateo County

March 26, 2022: There were no additional cases to report. As there were no additional cases for 14 days on the home premises, the quarantine was released.

Third EHV-1 Quarantine in Orange County

March 30, 2022: One additional horse on the premises displaying neurological signs was confirmed positive for EHV-1 on March 30. The horse is alive and under veterinary care. To date, there have been three confirmed EHM cases (EHV-1 infection with neurological signs) and 24 positive EHV-1 fever-only or mild clinical cases on this premises with two asymptomatic positives off premises but associated with this incident. CDFA is actively monitoring the situation.

RELEASED: Second EHV-1 Quarantine in Orange County

March 30, 2022: There were no additional cases to report. As there were no additional cases for 14 days on the home premises, the quarantine was released.

EHV-1 Quarantine in San Mateo County

March 30, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

You can also follow disease updates on the Equine Disease Communication Center website.

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