Peter Piot was one of the co-discoverers of the Ebola virus in 1976. "I never thought we would see such a devastating and vast epidemic," he says. Leon Neal/AFP/Getty Images hide caption

itoggle caption Leon Neal/AFP/Getty Images

A Public Health Agency of Canada worker seen inside the National Microbiology Laboratory's Level 4 lab in Winnipeg. Public Health Agency of Canada/Nature hide caption

itoggle caption Public Health Agency of Canada/Nature

A team of body collectors carry the corpse of a woman suspected of dying of Ebola in Monrovia, Liberia's capital. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

A technician tests samples from Ebola-infected patients at a field lab, run by Doctors Without Borders, in Kailahun, Sierra Leone. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

Shops are closed in Monrovia's West Point neighborhood as part of a quarantine to contain the spread of Ebola. Zoom Dosso/AFP/Getty Images hide caption

itoggle caption Zoom Dosso/AFP/Getty Images

A scientist tests a patient's blood for Ebola at the European Mobile Laboratory in Gueckedou, Guinea. The first cases reported in the outbreak occurred in a small village about eight miles outside Gueckedou. Misha Hussain /Reuters /Landov hide caption

itoggle caption Misha Hussain /Reuters /Landov

President Ellen Johnson Sirleaf apologizes to Eva Nah, the aunt of the teenager who was shot by Liberian security forces last week and later died. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

An ActionAid worker delivers basic goods to Amanda Ellis, whose mango business has crashed since five members of her family died of Ebola. She says that she has been abandoned by her friends. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

After arriving by ambulance, people with suspected Ebola virus lie on the ground before being admitted to the Doctors Without Borders Ebola treatment center in Monrovia, Liberia, last week. The 120 beds in the center were filled almost immediately. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images