"The scale of the outbreak is at least two to four times the number of cases that we have found," said WHO emergencies director Chikwe Ihekweazu.

The Ebola outbreak in eastern Congo is now the fastest-growing one in history and new challenges keep emerging

Infections of the Bundibugyo species of Ebola in the Democratic Republic of the Congo (DRC) have reached record highs and a majority of new cases are coming from “unknown chains…