A field study found more than 500 Bundibugyo Ebola cases in Mongbwalu from mid-January, months before Congo declared the outbreak and earlier than any model suggested.

Seventy-seven weeks after the first infections were detected in eastern Democratic Republic of Congo, the world's largest outbreak of the Bundibugyo strain of Ebola has crossed…

A field study found more than 500 Bundibugyo Ebola cases in Mongbwalu from mid-January, months before Congo declared the outbreak and earlier than any model suggested.