character: Robert Koch
topic: Koch's Postulates and Germ Theory
grade: 9
subject: Science
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character: Louis Pasteur
topic: Development of Germ Theory
grade: 9
subject: Science
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character: Giovanni Maria Lancisi
topic: Early Concepts of Disease Causation
grade: 9
subject: Science
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character: Edward Jenner
topic: Vaccination and Disease Prevention
grade: 9
subject: Science
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