character: Dr. Lisa Carter
topic: Herd Immunity and Vulnerable Populations
grade: 9
subject: Biology
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character: Dr. Emily Nguyen
topic: Vaccination and Public Health
grade: 9
subject: Biology
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character: Dr. John Smith
topic: Impact of Herd Immunity on Communities
grade: 9
subject: Biology
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character: Dr. Rachel Adams
topic: Protecting At-Risk Groups through Immunization
grade: 9
subject: Biology
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