it's also what david mckinney witnessed this week in sierra leone. >> taking incredible care to combat an unprecedented outbreak. >> gloves. ebola can lead to death with just one drop of infected fluids. >> that's why we take every possible precaution to prevent that. >> already, dozens of doctors and nurses have died in this outbreak. still, dr. kruger said he had to come. >> this is where they need us. there's a really big lack of resources. if we weren't here, in would be nothing. >> ebola hits many countries. this outbreak is out of control. >> in the last two weeks, they've doubled their capacity here for confirmed ebola patients, and they're doing all they can to help those who are sick, but they're absolutely at capacity here. >> the level of effort that it is right now, will it stop this disease? >> no, to be clear, no. and it's really difficult. we are -- we don't know where we're staying. it's frustrating for us, we don't have the capacity to go everywhere. >> here they do what they can. in the high risk zone, this woman calls out for help. she has ebola, so does her son. ebo