weren't interested in working on. >> simon: he had never heard of zmapp, and didn't know that gary kobingerht a small amount to the neighboring country of sierra leone to see if it could withstand heat and travel. kobinger never expected to put it to use, until word got to him that brantly wanted the drug. zmapp had cured monkeys, but no human had ever taken it. you knew it was experimental. you knew it had never been tested on a human being. did you have any hesitation, or did you figure "it's the only shot i've got?" >> brantly: i was dying. i was actively dying. so we thought this drug is possibly going to help. >> simon: you were both a patient and a guinea pig. >> brantly: i have gone from being physician to patient to lab rat. >> simon: after you took the zmapp, did you start feeling better very quickly? >> brantly: actually, my body began to shake and shiver violently, and my breathing got worse. >> simon: and you remember that? >> brantly: i remember the people around me praying over me. but after that first hour, my breathing improved, the shaking stopped. after two or three hours