Soldiers watch as people line up Friday at a supermarket in Concepcion, Chile. Some stores reopened Friday for the first time after the Feb. 27 earthquade in central Chile.

CONCEPCION, Chile — Huge piles of wreckage and tons of rotting fish and other debris blanketing the ground are turning the coastal towns shattered by Chile's earthquake and tsunami into nests of infection, doctors warned.

As Chileans lined up for hepatitis and tetanus shots Friday on the opening day of an extensive vaccination campaign, doctors said cases of diarrhea are increasing from people drinking unclean water and a growing number of patients are suffering injuries wading through the mess.

"We are going to keep needing water, electric systems, a functioning sewage system. We need to clean up rotting fish in the streets. We need chemical toilets, and when it starts raining, people living in tents are going to get wet and sick. All this is going to cause infections," said Talcahuano Mayor Gaston Saavedra, whose port city was heavily damaged by the Feb. 27 quake and tsunami.

The government faces other health care problems. Looting of pharmacies has made medicine scarce for people suffering from diabetes, hypertension and psychological illnesses, and 36 hospitals were heavily damaged or destroyed in the quake.

Chile said more than a dozen of its own military and civilian field hospitals were operating Friday. Mobile hospitals from a half-dozen other countries also were opening or about to open.