In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

Explanation

Several microorganisms are used for preparing medicines. Antibiotics are medicines produces by certain microorganisms to kill other disease causing microorganisms. These medicines are commonly obtained from bacteria and fungi. They kill or stop the growth of microorganisms. E.g. : Pencillium notatum produces, pencillin which checks the growth of staphylococci bacteria.