The success of the invented drug penicillin. The method of treating infected changed a lot. Due to the effectiveness of drug penicillin can stifle bacterial cell wall by the will to stifle substances (Peptidoglycan). Which is an important component of the cell wall of bacteria. From disturbing this makes creating in bacteria cell wall disruption could thrive. To grow or reproduce and make the bacteria die down eventually. Currently used treatment of various kinds.