character: Vaccine Advocate
topic: How Vaccines Stimulate a Secondary Immune Response
grade: 9
subject: Biology
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character: Immunology Expert
topic: Understanding the Immune System and Memory Cells
grade: 9
subject: Biology
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character: Public Health Advocate
topic: The Importance of Vaccination for Herd Immunity
grade: 9
subject: Biology
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character: CDC Scientist
topic: Vaccines and Their Role in Protecting Public Health
grade: 9
subject: Biology
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