Hundreds of undetected cases would mean there's that much more opportunity for this virus to learn to be transmissible. With every case, we worry about the possibility of the virus acquiring the ability to transmit from human to human.

197

I don't know if I'll ever get the chance to go out there again.

192

Luckily, it looks roughly like less people die with Ebola subtype Sudan, ... Also, the hospitals there are more sophisticated so the there's a better survival rate.

192

Now that we're seeing it in a place that straddles Europe and Asia, it's different. It's spread so far geographically.

175

There's been a half dozen Ebola outbreaks in the world -- ever recorded -- so everything you do is groundbreaking.

156

When we landed, we were faced with an outbreak on the order of 300 cases.

148