Philadelphia Park officials were cautiously optimistic a horse from the barn of Ramon Martin does not have equine herpesvirus despite having been exposed to the virus at an equine clinic in New Jersey.

"The horse isn’t exhibiting any signs that it may have EHV-1, but a nasal swab and blood samples were taken (Nov. 2) to make sure," Philly Park director of racing Sal Sinatra said. "In the meantime, we’ve extended our quarantine for an additional 21 days."

If no horses test positive for EHV-1, the restrictions on horses shipping to the Philly Park backstretch will be lifted Nov. 23. The track isn’t accepting shippers because of an EHV-I case at Monmouth.

Sinatra said the horse in question was at the Mid-Atlantic Equine Medical Center in Ringoes, N.J., where it was exposed to the EHV-1 virus