Caption: Alexander Fleming (1881-1955), British bacteriologist. Montage of images showing the life and work of Fleming, who is best known for his discovery of the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the mold Penicillium notatum in 1928. He was awarded a share of the 1945 Nobel Prize in Physiology or Medicine, together with Howard Florey and Ernst Boris Chain. Fleming's accidental discovery and isolation of penicillin marked the start of modern antibiotics. He also discovered that bacteria developed antibiotic resistance whenever too little penicillin was used or when it was used for too short a period. Fleming cautioned about the use of penicillin in his many speeches around the world.

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Alexander Fleming, British bacteriologist

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