MONROVIA, LIBERIA – AUGUST 17: A Doctors Without Borders (MSF), staffer supervises as construction workers complete the new MSF Ebola treatment center on August 17, 2014 near Monrovia, Liberia. The facility initially has 120 beds, making it the largest such center for Ebola treatment and isolation in history and MSF plans to expand it to a 350-bed capacity. The virus has killed more than 1,000 people in four African countries, and Liberia now has had more deaths than any other country. (Photo by John Moore/Getty Images)