UPDATE: Four symptomatic horses in stable condition at equine medical center

Four horses that are being held in the Biosafety Level 2 isolation unit at Virginia Tech's Marion duPont Scott Equine Medical Center are in stable condition after exhibiting symptoms of the Equine Herpesvirus Type 1 (EHV-1). According to hospital officials, two of the horses have tested positive for the virus while results of tests performed on the remaining two animals are expected early next week.