A deadly plant, a school lockdown, and 15 hours to survive.Those are the chilling elements at the center of “Roots of Contagion,” the upcoming Filipino suspense-thriller directed by Jose “JR” Olinares, which aims to combine edge-of-your-seat horror with public awareness on disease prevention.Presented by Pinoyflix Films, the movie follows students of Colegio de San Juan de Letran-Calamba as they become trapped inside their campus after exposure …