Hunting Down Ebola in Sierra Leone

After an Ebola outbreak killing about 1,500 people in Sierra Leone, the country is relying heavily on investigators to hunt down Ebola wherever it breaks out and stopping it on its tracks. Victims have barely been carried off before the questions begin: "How many people live here? Have you traveled recently or attended funerals?" The teams of interrogators, known as "contact tracers", are mainly volunteers with immunity after surviving the virus. They ...