Veterinarians confirmed a 15-year-old pony mare displaying neurologic signs of equine herpesvirus myeloencephalopathy (EHM) on June 27, 2018. The mare originated from a San Mateo County facility, and an additional horse originating from the same property—a 24-year-old Tennessee Walking Horse mare—displayed a fever and tested positive for equine herpesvirus-1 (EHV-1).
Authorities have isolated and placed both mares under quarantine, and enhanced biosecurity is in effect. Exposed horses will be monitored for clinical signs, and temperatures will be taken twice daily. Any horse displaying a fever or compatible clinical signs will be tested. The California Department of Food and Agriculture (CDFA) will continue to monitor the situation and release new information as it becomes available.
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