character: Louis Pasteur
topic: Vaccination and Germ Theory
grade: 9
subject: Biology
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character: Edward Jenner
topic: Early Vaccination Techniques
grade: 9
subject: Biology
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character: Robert Koch
topic: Postulates of Germ Theory
grade: 9
subject: Biology
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character: Jonas Salk
topic: Polio Vaccine Development
grade: 9
subject: Biology
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