Two new projections about the Ebola epidemic predict a huge spike in cases in just a few weeks - as many as 21,000 in Sierra Leone and Liberia alone in just over a week if something isn't done fast. But action that's already under way is beginning to reverse the worst trends, and the Centers for Disease Control and Prevention says, a rapid scale-up of help can turn things around. The CDC's latest calculations show that at least 8,000 people will have become infected by the end of this month - and maybe as many as 21,000, because it's clear that most cases are being missed.