Dr. Stuart Levy is a professor at Tufts University Medical School, and has just written a book, "The Antibiotic Paradox: How Miracle Drugs Are Destroying the Miracle," (Plenum). This book looks at the threat of antibiotic-resistant bacteria that are resulting from over-prescription of antibiotics. Dr. Levy is recognized internationally as an expert on resistance and as a critic of the widespread misuse of antibiotics. He is also president of the International Alliance for Prudent Use of Antibiotics.