Chile fears health crisis as aid trickles in

>> thanks.

>>> let's turn to chile where the u.s. military arrived for the first time since the devastating earthquake hit one week ago. about 50 u.s. troops along with two cargo planes arrived to deliver aid. meanwhile, at least seven aftershocks hit today raising new concerns about the pace of recovery. we get the latest from nbc 's peter alexander .

>> reporter: in the heavily damaged city of concepcion, international aid is beginning to arrive. saturday's shipment, 35 tons of food. the first delivery to help feed 35,000 children who live in this battered community. elsewhere, residents raided a fish cannery. walking away with boxes of food. touring the quake zone today, united nations secretary-general, who visited fire fighters at a collapsed apartment building where at least nine people died.

>> now it is the moment for the international community , united nations , to stand with the people of chile.

>> reporter: already this resilient nation is standing up for itself. with musicians, athletes, and the country's president, teaming up for a day-long telethon in hopes of raising $30 million for quake relief. with the wreckage and trash piling up, there are now worries about the possible outbreak of diseases like hepatitis and tetanus. the delivery of vaccinations and clean water took nearly a week. the government's explanation -- the roads are so damaged that supplies could only be delivered by ships and helicopters. still, critics blame a lack of government coordination.

>> we were not prepared as a country to face this huge earthquake. and its immediate consequences.

>> reporter: more than 200 aftershocks and new earthquakes in the last week have triggered fears and sometimes panic. nbc 's mike taibbi is in santiago.

>> reporter: each powerful aftershock, a reminder, impossible to ignore in a capital where most seem to be living life the way it was before last saturday. images so formal that these american exchange teachers lived through the earthquake.

>> the ground was wavy. we could see cars lifting up on the street.

>> reporter: said by midweek it seemed like business as usual . though there are still downed bridges and miles of ruined highway, one week later, repairs at the airport are now under way. even as the ground continues to shake and rattle nerves. peter alexander , nbc news.

>>> back here at home, president