This Day In History: September 3

Changing the day will navigate the page to that given day in history. You can navigate days by using left and right arrows

Sir Alexander Fleming was a young bacteriologist when an accidental discovery led to one of the great developments of modern medicine on September 3, 1928. Having left a plate of staphylococcus bacteria uncovered, Fleming noticed that a mold that had fallen on the culture had killed many of the bacteria. He identified the mold as penicillium notatum, similar to the kind found on bread. 

In 1929, Fleming introduced his mold by-product called penicillin to cure bacterial infections.


Also on This Day in History September | 3