The Lone Star Park stables of three trainers, including meet leader Bret Calhoun, were placed under quarantine indefinitely on Thursday after each had a horse test positive for equine piroplasmosis. The directive came from the Texas Animal Health Commission.
Equine piroplasmosis is a tick-borne disease that can lead to loss of appetite, fever, anemia, labored breathing, colic and in some cases, death.
Other trainers whose stables are under quarantine are those of Kevin Favre and Brian House, whose horse that tested positive has since shipped to New Mexico.