The Ebola outbreak is getting worse. The death toll has now risen to more than 1,550 people.
The World Health Organization warned Thursday that more than 20,000 Ebola cases before the outbreak ends. In the meantime, the Food and Drug Administration has given researchers the greenlight to start testing a new Ebola vaccine in humans.
CNN's Chief Medical Correspondent Doctor Sanjay Gupta.View my Flipboard Magazine.