character: Dr. Jane Smith
topic: Epidemiology and Herd Immunity
grade: 9
subject: Science
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character: Professor John Doe
topic: Impact of Vaccination on Herd Immunity
grade: 9
subject: Science
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character: Dr. Emily White
topic: Protecting Vulnerable Populations through Herd Immunity
grade: 9
subject: Science
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character: Dr. Alex Brown
topic: Understanding Epidemiology's Role in Public Health
grade: 9
subject: Science
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