"The reality is this outbreak's not over," says Dr. William Fischer, speaking about Ebola. "It's just changed."
Fischer, a professor at the University of North Carolina who's been studying Ebola survivors, was speaking about the new cases in Liberia. On Monday, a 15-year-old died of the disease. The teenager's father and brother have also tested positive for Ebola. Health authorities have not yet determined how the family was infected.