The symptoms started at a July training camp with Central Cross Country (CXC) in northern Wisconsin. The runner-up from last year’s SuperTour series, Jennie Bender, 24, wasn’t feeling well. For two to three days at a time, she’d experience bouts of nausea. Then her neck felt sore, along with her jaw and teeth. One night, she tossed and turned with cold chills, and feared that she’d wake up a leper. The next day, she pushed...