but trachoma isn't the worst problem its physicians face.any patients suffer from diarrhea, especially young children. >> right now we're seeing children come to us when it's almost too late. they've already become very weak. we even have children who've already gone into shock. so we witness children die in our ward almost every day. naturally we do our best, but our resources are limited. >> doctors without borders is trying to fly in more personnel, to improve conditions. the aid organization is expanding its operations here -- even though it has already come under attack from [north] sudan. last november bombs were dropped on yida. newcomers to the camp are getting a tour. the hospital used to be run by two doctors and six international aid workers. their numbers have doubled, but they're still understaffed. >> you can see here that the sanitation and hygiene situation is unbearable. it's at the crisis level. it's a medical emergency in terms of the number of children who die. >> contaminated drinking water is often to blame. while the w