Five additional horses have tested positive for equine herpesvirus-1 (EHV-1) in conjunction with the case that placed the University of Tennessee Veterinary Medical Center (UTVMC) under quarantine, according to a statement from the hospital. No new cases have been diagnosed at the UTVMC.

"Independent tests have confirmed six horses in total have been diagnosed with EHV-1, all from a single location," the statement read, adding that the home premise of all six confirmed EHV-1 cases is the Dixie Stampede Show located in Pigeon Forge.

The index case was admitted to the UT Veterinary Medical Center on Sept. 15.

"Our laboratory and an outside independent laboratory have both confirmed that the index horse that was euthanized within hours of being admitted was positive for the neurotrophic (neurologic) form of EHV-1," said Sandra Harbison, media relations director for UTVMC