HALLANDALE BEACH, Fla. – The quarantine that will prevent horses stabled at Payson Park from racing here for at least the next three weeks should have a minimal effect on entries, P.J. Campo, Gulfstream Park’s general manager and vice president of racing, said on Wednesday. An unidentified horse tested positive for the equine herpesvirus at Payson Park on Monday, leaving the approximately 480 horses stabled there in quarantine for 21 days.