Doctors Without Borders/Médecins Sans Frontières (MSF) has treated hundreds of people with the disease and helped to contain numerous life-threatening epidemics. MSF responded in the worst affected countries – Guinea, Liberia and Sierra Leone - through setting up Ebola Management Centers and providing services such as psychological support, health promotion, surveillance and contact tracing. At its peak, MSF employed nearly 4,000 national staff and over 325 international staff to combat the epidemic across the three countries.