The Colorado Department of Agriculture and the Colorado Division of Racing Events June 29 lifted the quarantine on Arapahoe Park's stable area, which was in response to a positive test result for Equine Infectious Anemia.
Movement in and out of the track's stable area was restricted from June 23-28.
"We're pleased that all the organizations and horsemen involved responded strongly to ensure that the situation remained under control," said Arapahoe Park executive director Bruce Seymore.
EIA is a viral disease that affects equine animals only and does not affect humans.