Penicillin was one of the first antibiotics created and used on the population. Sir Alexander Fleming changed the world of medicine not only in his days but also in present-day society. Penicillin was one of the greatest discoveries of the twentieth century, as antibiotics are one of the highest prescribed drugs in the world today. Penicillin is responsible for preventing the spread of infectious disease, and for improving military medicine. While revolutionizing the study of medicine, penicillin saved countless numbers of lives while playing a key role in the development of other antibiotics and prevention of the spreading of disease. Before the discovery of penicillin, scientists had a general idea about bacteria, or rather its existence,
