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Antibiotics are used to treat infections caused by bacteria,such as those that cause strep throat, gonorrhea, and tuberculosis. Well-known antibiotics include amoxicillin, cephalexin, azithromycin,and levofloxacin. Antibiotics kill bacteria that once routinely caused fa-In September 2013, the Centers for Disease Control and Preven-tal illnesses. Since the 1940s, antibiotic use has reduced