About 15 years ago, the rapid diagnosis of a peanut allergy saved the life of a young child, and in the process earned the admiration of a local family. When Jim Sipala and his wife, Danielle, rushed their then-18-month-old son Alex to the Nemours/Alfred I. duPont Hospital for Children emergency room, Alex was already very weak and in respiratory distress. “We were very scared, but it did not...