angus walkeror nbc news in tacloban, the philippines. >> reporter: this is dr. nancy snydman. wateand wind, devastating this country. now, there is anher threat. water-borne infectus disease. 61-yeaold edgar arabella is livingn a shack, drinking dirty water. he has lost everytng. >> i am just tir. supposed to be drinking sea water and dirty waters. trng to survive. >> reporter: we're now dealing with a new heah emergency, and that is lack of good wer. wh the storm surge swaed cloban, the already fragile water system was one of the casuales. cleawater is now very hard to find and people are now drinking fromnd bathing inhe same water that is filledith sewage, corpses, and debris. that has hlth officials worried. what are the risk factors to ople? babies, middle aged pele, and elderly when they ce into contact with bad water? >> the risks are -- e risks to their health, they could get diarrhea, and phoid fever, it could gravate the situation. >> reporte these are illnesses that the doctor is beginning to see. have you seen caseof diarrhea yet? >> mostly childr. we have cases of