these patients are fighting one of the deadliest viruses in the world. it has shut off their immune system, up to nine out of ten patients will dpi. buy this horror is isolated. we found traffic to still be busy here, markets are full. children, lots of children still smiling. you see, as scary as ebola ask, it's not easily today justice. people don't spread it until they are sick, really sick. when that is the case, the patients are not up walking around on the busy streets. they are down in bed, in hospitals or worse. even the dead are highly contain outside. >> dr. pierre rollin from thec d