Corey Felty graduated from Countryside High School in May, and he planned to start classes at St. Petersburg College this fall. Instead, the 18-year-old came out of a monthlong coma on Aug. 16.

After that, he had to relearn how to sit up and how to walk. Ginny Felty, Corey's mother, said her son is still afflicted by uncontrollable twitches and mood swings. Last month, she filed suit in ...