character: Albert Sabin
topic: Oral Polio Vaccine Development
grade: 9
subject: Science
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character: Jonas Salk
topic: Inactivated Polio Vaccine
grade: 9
subject: Science
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character: Polio Virus
topic: Vaccine Research and Development
grade: 9
subject: Science
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character: Centers for Disease Control and Prevention (CDC)
topic: Public Health and Vaccination Programs
grade: 9
subject: Science
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