Quarantine Alert from CDFA – EHV-1

A 15 year old Pony mare, originating from a San Mateo County facility, displaying neurologic signs has been confirmed positive for Equine Herpesvirus Myeloencephalopathy. An additional horse originating from the same property, a 24 year old Tennessee Walking Horse mare, displayed a fever and tested positive for Equine Herpes Virus-1. Both mares have been isolated, placed 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. CDFA will continue to monitor the situation and post new information as it becomes available.