Piper Johnson was all packed and ready to drive across country with her mom to start college when the 18-year-old noticed a pain in her chest. She took an Advil and hoped the pain would go away.
It didn't. During the drive from her hometown of New Lenox, Ill., near Chicago, to the University of Northern Colorado in Greeley, Colo., she realized something was very wrong. "I kept feeling worse and worse," Johnson says. She developed a high fever, felt extremely lethargic, and noticed a rapid heart beat.