In the aftermath of Hurricane Katrina, those affected have had to deal with many challenges, and now there is another growing concern -- disease. Floodwaters from Hurricane Katrina cover a large portion of New Orleans Thousands of displaced people in New Orleans, still without food or water... Survivors making their way past corpses left on the street ... "We want help! We want help," they chant. And the floodwaters that submerged approximately 80 percent of the city of New Orleans have now become a dangerous sea of gasoline, sewage, decay... and a breeding ground for disease. Dr. Julie Gerberding of...