EHM Quarantine Lifted From California Premises
Alameda County presently has no EHV-quarantined premises. | Photo: Wikimedia Commons
After all positive horses on a previously quarantined Alameda County premises had two negative tests for equine herpesvirus (EHV-1) seven days apart, officials at the California Department of Agriculture (CDFA) lifted the facility’s quarantine on Nov. 5.

The quarantine resulted after one horse, a 12-year-old Arabian mare, developed clinical signs on Oct. 16 and was confirmed positive for the neurologic form of EHV-1, also known as equine herpesvirus myeloencephalopathy (EHM).

On Oct. 18, CDFA quarantined 64 exposed horses on the Arabian mare’s premises and implemented enhanced biosecurity protocols, including twice-daily temperature monitoring.

CDFA confirmed a 9-year-old gelding, which was among the exposed horses and subsequently developed neurologic signs, as positive for EHV-1 on Oct. 19. The gelding was isolated and monitored off-site and enhanced biosecurity measures implemented

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