Ebola disease from the fast-moving outbreak in Congo has now spread to four other countries, including two where it's active. It has spread farther across Africa than any previous Ebola outbreak, reaching three regions.
Nigeria on Tuesday became the latest country affected by the outbreak, which was first declared in eastern Congo in mid-May. Caused by the rare Bundibugyo virus for which there's no approved vaccine or drug, the outbreak has killed at least 4,600 of the 9,500 people infected in Congo.
