This Day in History:, Penicillin Is Discovered .<br />September 28, 1928.<br />Penicillin was discovered by Scottish <br />bacteriologist Sir Alexander Fleming. .<br />Returning to St. Mary's Hospital in London after a <br />vacation, Fleming noticed that a mold had contaminated <br />Petri dishes of a common infectious bacteria.<br />Fleming was stunned to <br />realize that the Penicillium <br />notatum mold was preventing <br />the growth of the bacteria.<br />Fleming concluded that the Penicillium "mold juice" <br />could be manipulated to fight infectious diseases.<br />I certainly didn’t plan to revolutionize all medicine by discovering the world’s first antibiotic, or bacteria killer. <br />But I guess that was exactly what I did, Sir Alexander Fleming, via <br />'PBS News Hour'.<br />After 14 years of trial and error, penicillin was <br />perfected through the collaboration of Sir Fleming, <br />Dr. Howard Florey and Dr. Ernst Chain
