one of the main roads in tacloban. it used to be fine houses and shops. it is now lined with debris of this once bustling city. with its still uncollected dead. philippine troops are pouring in to tacloban. paul kennedy leading the u.s. effort said security is a growing concern now. >> you are going to have probably flare-ups of violence. you know, the longer that we drag out our ability to support them, support these communities, the more they are going to get frustrated. >> reporter: but the real killer here now is disease. the children, the most vulnerable. at the shattered tacloban hospital, a mother cradled her dead infant. i just told my baby, i am sorry. she says. we don't have money. and we don't have anyone to help us. >> reporter: in a neighborhood nearby, mary rose has five children and they are all sick, feverish, hungry, lethargic. >> they have fever. >> they have fever. >> hello, little one. yes. you don't know.