" To study its effect on a living, struggling human body, he meant. To do that, you would need the right combination of hospital facilities, BSL-4 facilities, dedicated and expert professionals, and circumstances. You couldn’t do it during the next outbreak at a mission clinic in an African village. You would need to bring Ebola virus into captivity—into a research situation, under highly controlled scrutiny—and not just in the form of frozen samples. You would need to study a raging infection inside somebody’s body. That isn’t easy to arrange. He added: “We haven’t had an Ebola patient yet in the US.” But for everything that happens, there is a first time. "

― David Quammen , Spillover: Animal Infections and the Next Human Pandemic