Why health officials do not have a good handle on the current Ebola outbreak

Health investigators in the Democratic Republic of Congo interview individuals as part of their contact tracing — seeking to find those who came into contact with people infected with Ebola.

To get slightlyahead of the virus, health officials need to quickly identify people at risk of infection, a practice known as contact tracing. That's a challenge in the Democratic Republic of Congo.

(Image credit: Michel Lunanga)