WASHINGTON (AP) — A single funeral caused many.

Stephen Gire and other health researchers on the ground in Africa had some hope that the Ebola outbreak was coming under control or at least plateauing in late May. Then came the funeral of a healer in Guinea. More than a dozen of the mourners contracted the disease there, probably by washing or touching the body, and took it to Sierra Leone, according to a new genetic mapping of the Ebola virus that scientists hope will help them understand what makes this killer tick.