but this horror is isolated in ginlny. we found traffic to still be busy here. markets are full. children, lots of children, still smiling. you see, as scary as ebola, it's nottically contagious. it doesn't disperse easily through the air and it doesn't live long on surfaces either and people don't typically spread it until they're sick, really sick. and if 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 contagious. >> the story is always the same. >> dr. pierre rolen has helped trace ebola outbreaks for many years. >> the risk is not the people dealing with ebola patient it's the people dealing with regular patient not thinking of ebola. >> it only takes a small amount of the virus anywhere on your skin to cause an infection and as i learned no precaution is too small for the doctors who care for these patients. so, nothing gets in. >> nothing gets out. >> nothing gets out. tim is one of the doctors without borders. he's from canada. he comes into these settings for weeks at a time.