CHICAGO (AP) — Repeated warnings that antibiotics don't work for most sore throats and bronchitis have failed to stop overuse: Doctors prescribed these drugs for most adults seeking treatment at a rate that remained high over more than a decade, researchers found. The results are in two analyses of national health surveys from the late 1990s to 2010, representing more than 2 million annual visits to doctors' offices or emergency rooms. Antibiotics can have bad side effects, including stomach pain and severe diarrhea, and inappropriate prescriptions put patients at needless risk.