15 September 1928 On this day in history . . . Scottish bacteriologist, Alexander Fleming, discovered penicillin while studying influenza. https://www.onthisday.com/people/alexander-fleming?utm_source=On+This+Day+in+History+by+OnThisDay.com&utm_campaign=069fc2cf98-DE+GE&utm_medium=email&utm_term=0_b15ebf209d-069fc2cf98-113092938