character: Louis Pasteur
topic: Development of vaccines and germ theory
grade: 9
subject: Biology
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character: Edward Jenner
topic: Smallpox vaccine and immunization techniques
grade: 9
subject: Biology
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character: Robert Koch
topic: Postulates of germ theory and his contributions to microbiology
grade: 9
subject: Biology
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character: Jonas Salk
topic: Polio vaccine and its impact on public health
grade: 9
subject: Biology
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