It sounds like the plot of a sci-fi flick: Through the misuse of antibiotics and other factors, some forms of bacteria have mutated and become resistant to all known antibiotics. Coined "superbugs" by the media, these super-strength bacteria threaten to become so potent, they pose a threat to all of us. Can these fears possibly be founded? Rising antibiotic resistance is very real, due primarily to the enormous amount of antibiotics used in this country, says Richard Besser, M.D., a medical epidemiologist and pediatrician at the National Center for Infectious Diseases at the Centers…