character: Pathogen Interaction
topic: How Pathogens Interact with the Immune System
grade: 9
subject: Science
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character: Immune Response
topic: The Role of White Blood Cells in Fighting Pathogens
grade: 9
subject: Science
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character: Disease Transmission
topic: How Pathogens Spread and Affect the Immune System
grade: 9
subject: Science
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character: Vaccination
topic: How Vaccines Help the Immune System Recognize Pathogens
grade: 9
subject: Science
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