Before dinner on July 29, 3-year-old Carter Roberts of Chesterfield, Va., seemed perfectly healthy. That evening, he vomited. When he woke up the next morning with a slight fever of 99 degrees, his mother, Robin Roberts, figured that he was coming down with a cold. The next morning, she found him collapsed on his bedroom floor. “Mommy,” she recalls him saying. “Help me, help me.”

Carter could barely stand when she picked him up, and his neck was arched backward. “What was most alarming,” she said, “is he had no control over his right arm whatsoever.” In the hospital, Carter lost control of his right arm, then over his legs and other muscles within a few days. He now can only wiggle a toe and move the left side of his face. He has been diagnosed with a mysterious, polio-like illness called acute flaccid myelitis, a condition that seems to be surging this year. READ MORE