The Idaho State Department of Agriculture (ISDA) has confirmed that two horses in Bonneville County were euthanized after exhibiting neurologic signs consistent with equine herpesvirus-1 (EHV-1). Laboratory testing conducted on one of the horses prior to euthanization confirmed the animal was positive for neurologic EHV-1, the department said.

"The index case was first observed to have symptoms last Tuesday (Oct. 28)," said Scott Leibsle DVM, Dipl. ABVP, ISDA deputy state veterinarian. "The second horse’s symptoms were observed last Thursday (Oct. 30)."

Leibsle told TheHorse.com that the affected farm is a private facility that was home to five horses. None of the horses on the affected farm have traveled off the premises in recent months, and no outside horses have visited the facility recently, Leibsle said.

"The remaining three horses are being monitored and have not exhibited any symptoms of illness as of yet," he said. "The neighbors of this facility that own horses have also been notified of the incident and have agreed to monitor their horses for the next 14 days to watch for symptoms