Ebola vaccine

Scientists launched a large trial Monday to test two vaccines. But testing Ebola drugs in West Africa is proving more difficult than expected because the disease is disappearing rapidly.

Angry mobs that targeted health workers. A single funeral that infected 365 people. No isolation wards in Liberia. These are some of the striking points in WHO's new analysis.

It's been tough to design tests because some people object to the idea that a comparison group won't receive the vaccine. But plans are moving ahead.