The California Department of Food and Agriculture (CDFA) has reported one additional confirmed case of neurologic equine herpesvirus-1 (EHV-1) at the Orange County facility quarantined since Jan. 11. No additional cases have been confirmed at the Riverside County facility that saw an EHV-1 positive horse euthanized Jan. 24.

The newly confirmed Orange County case brings the total to 16 confirmed cases. Only one horse–the index case–has displayed neurologic signs and is reportedly recovering, the statement indicated. One horse was euthanized on Jan. 18 after becoming recumbent; however, a necropsy led veterinarians to believe the recumbency was unrelated to the EHV-1, the CDFA said.

In Riverside County the CDFA reported that a necropsy on the euthanized horse found histologic lesions compatible with EHV-1. The CDFA also noted that the "large multidiscipline equine premises" where the horse was residing has been quarantined as a result of the confirmed EHV-1 case.

"Based on the initial investigation, there is no evidence to link this case to the Orange County premises," the department noted