The Bundibugyo epidemic, the world's second-largest, has been described as the fastest-spreading on record.

DR Congo Ebola outbreak has killed 1,707 of 3,802 confirmed cases since May. The Bundibugyo strain has no approved vaccine as WHO races to start trials.

This outbreak, caused by the **Bundibugyo virus**, has become the second-largest Ebola outbreak ever recorded and the fastest-spreading in Congo’s history.