Antibiotic resistance

摘要

Well-known antibiotics include amoxicillin, cephalexin, azithromycin, and levofloxacin. Antibiotics kill bacteria that once routinely caused fatal illnesses. Since the1940s, antibiotic use has reduced death and disease related to infections around the world. However, some bacteria have become resistant to the antibiotics that were previously used to treat them. They can continue to grow and make people sick even when exposed to a drugthat killed the bacteria in the past. As a result, different and stronger drugs are constantly needed to fight bacterial infections.