KGO Nightline August 8, 2012
to break out of the hot zone and travel around the globe is more frightening than ever. >> we don't have high walls around our country. just because something happens far away in africa, doesn't mean that it can't happen back in the united states. >> so he'll be coordinating that? >> reporter: our journey begins at cdc's headquarters in atlanta. my old stomping grounds. i worked here for 13 years. i'm here to meet the team i'm embedded with. led by epidemiologist barbara knust. this unassuming westerner and mother of a 1-year-old investigates deadly diseases all over the world but th...