Two barns at Parx Racing, in Bensalem, Pa., are under quarantine as a result of a positive test for equine herpesvirus (EHV-1), officials said Nov. 13.

According to a Pennsylvania Department of Agriculture statement, "Some horses at the track came into contact with the positive horse and have shown clinical signs of the disease, ranging from fever to neurological impairment. The horses remain under quarantine until test results are completed."

The EHV-1-positive horse is trained by Steve Klesaris, who stables in Barn 21. Several other trainers have horses in the barn; none are permitted to train.

Barn 34 is under quarantine because a horse from Barn 21 was recently claimed and moved there. Parx officials said testing on that horse is under way, but in the meantime no horses from that barn will be permitted to train. In addition, a pony barn was quarantined pending test results on a sick horse