character: Louis Pasteur
topic: Microbiology and the Germ Theory of Disease
grade: 9
subject: Science
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character: Robert Koch
topic: Koch's Postulates and Bacterial Pathogens
grade: 9
subject: Science
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character: Joseph Lister
topic: Aseptic Techniques in Surgery
grade: 9
subject: Science
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character: Ignaz Semmelweis
topic: Hand Hygiene and Disease Prevention
grade: 9
subject: Science
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