What is Ebola virus disease?
Ebola virus disease is a rare but serious disease caused by infection with the Ebola virus. It was first identified in 1976 near the Ebola River in the Democratic Republic of Congo (formerly Zaire).
Since March of 2014, there have been outbreaks of Ebola virus disease in the West African countries of Liberia, Sierra Leone, and Guinea. Nigeria and Senegal also reported a small number of cases, but the virus has been contained in these countries. On average, Ebola virus disease leads to death in about half of the people who are infected.