Additional testing has been ordered on tissue samples from a horse that tested positive for the equineherpes virus (EHV-1) Feb. 24 at Philadelphia Park.Officials had hoped that tests done by the New Bolton Center of the University of Pennsylvania on Kari Oakie, a 3-year-old filly who was euthanized after falling during training hours with a suspected spinal cord injury, would be complete Saturday."The tests were inconclusive," said Sal Sinatra, Philadelphia's director of racing. "We're having additional tests done by Cornell University, and I'm hoping we'll have some answers by Tuesday."A nasal swab test, which is not considered 100% accurate, indicated EHV-1 when performed on Kari Oakie before she was euthanized. Sinatra said that it's also a possibility that the filly, a daughter of Concerto, had equine protozoal myeloencephalitis (EPM), a neurologic disease.Philadelphia Park has been under a quarantine since Jan. 24, and Sinatra was planning to lift it on March 7. However, the quarantine has been extended until the tests from Cornell are complete. No horses are allowed onto the backstretch from other tracks, farms, or training centers.More than 40 horses stabled in the barn that housed Kari Oakie are also quarantined and cannot leave to race or train.The racing office has started to feel the effects of filling races with just the available horse population. Just eight races were carded for Sunday, a day in which nine are normally scheduled.