character: Robert Koch
topic: Bacterial Theories of Disease
grade: 9
subject: Science
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character: Louis Pasteur
topic: Germ Theory and Vaccination
grade: 9
subject: Science
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character: Joseph Lister
topic: Antiseptic Surgical Techniques
grade: 9
subject: Science
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character: Ignaz Semmelweis
topic: Hand Hygiene and Infection Control
grade: 9
subject: Science
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