Phases of Clinical Evaluation of an Investigational Vaccine
Phase Number and Type of Study Participants | Scientific Questions Asked |
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1 20 to 100 healthy adults |
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2 Several hundred from target population |
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3 Several hundred to tens of thousands from target population |
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Source. Adapted from: Centers for Disease Control and Prevention: Vaccines. Parents. CDC.gov website. https://www.cdc.gov/vaccines/parents/infographics/journey-of-child-vaccine-h.pdf. Updated July 2018. Accessed December 12, 2020.