Sierra Leone is at the epicenter of the Ebola outbreak. To help stop the virus, health workers are putting up Ebola awareness posters around the country. One doctor explains why they're so graphic.

The WHO on Thursday reported 57 new deaths in the four days to July 27 in Guinea, Liberia, Sierra Leone and Nigeria, raising the death toll to 729. It said the number of Ebola cases had topped 1,300.

A graphic shows the Coronavirus dominating SARS, MERS and Ebola when it comes to total infections, but it doesn't tell the whole story.