Doctors in New Orleans are bracing themselves for what they call a "second disaster" as New Orleans-area residents return to their devastated city. While environmentalists warn of the long-term danger to health from possibly polluted floodwaters, and rumors of disease swirl, front-line emergency doctors say the actual health danger will come from accidents. "The second wave of disaster is when you welcome the people back and the infrastructure of the city is not in place," said Dr. Peter Deblieux, an emergency room doctor at downtown New Orleans' Charity Hospital.