Coroner says common bacteria killed Antioch girl By Sandy Kleffman CONTRA COSTA TIMES ANTIOCH - The mystery is solved. Experts at the federal Centers for Disease Control and Prevention in Atlanta have discovered what killed 7-year-old Jessie Geyer of Antioch. But the answer causes even more anguish for her parents. Jessie died from a group A streptococcal infection that spread throughout her body. A CDC fact sheet describes it as a common bacterium that doctors treat with antibiotics. Although her parents rushed Jessie to a pediatrician and a hospital emergency room two days before her death, no one gave her...