In a new report by the American Academy of Pediatrics calling for an end to overuse of antibiotics in animals. The "overuse" and "misuse" of antibiotics in animals and in people in largely to blame for antibiotic resistance. In 2012, most antibiotics in the United States weren't sold to help humans. Some 80%, or 32.2 million pounds, of antimicrobrial agents were for use with animals, according to the report. Some 60% of those drugs are the same ones that help fight infections in humans.