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Alexander Fleming
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Sir Alexander Fleming sits holding a petri dish in one hand, wearing a suit and bow tie, with papers stacked beside him. Sir Alexander Fleming sits at a desk looking through a microscope, with laboratory equipment and papers nearby. Penicillium notatum and penicillin Alexander Fleming
How penicillin was discovered and developed
Alexander Fleming Alexander Fleming and penicillin
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Alexander Fleming: Media

Scottish bacteriologist
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How penicillin was discovered and developed
Archival footage of Alexander Fleming and the discovery of penicillin.
Video: Encyclopædia Britannica, Inc.

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Alexander Fleming
Alexander Fleming.
© Baron—Hulton Archive/Getty Images
Alexander Fleming
Alexander Fleming.
Baron/Hulton Archive/Getty Images
Penicillium notatum and penicillin
Penicillium notatum, the source of penicillin.
© Kateryna Kon/Shutterstock.com
Alexander Fleming
Alexander Fleming, 1944.
U.S National Library of Medicine
Alexander Fleming
Alexander Fleming, 1952.
AP Images
Alexander Fleming and penicillin
Alexander Fleming's culture plate showing the dissolution of staphylococcal colonies...
National Library of Medicine, Bethesda, Maryland
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