In summer 2003, Missy and Michael Stogner of Lancaster’s Antioch community were desperate to know the cause of their 3-year-old daughter Kaytlin’s illness. Pediatricians said she had a viral infection that had to “run its course.” But the flu-like symptoms lingered and worsened, her nausea and lethargy so bad she couldn’t get off the couch, muscle pain so deep even a soothing touch hurt and a fever so intense it smoldered for a week between 103 to 104 degrees.