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On this day, in 1929 Sir Alexander Fleming discovers Penicilin

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Sir Alexander Fleming was a young bacteriologist when an accidental discovery led to one of the great developments of modern medicine on this day in 1929.

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.

On February 14, 1929, Fleming introduced his mold by-product called penicillin to cure bacterial infections.

 

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