No abstract available
MeSH terms
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Child
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Child, Preschool
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Contraindications
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Humans
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Immunization Programs / legislation & jurisprudence*
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Immunization Programs / methods*
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Immunization, Passive
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Infant
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Infant, Newborn
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Smallpox / prevention & control
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Smallpox Vaccine* / therapeutic use
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Societies, Medical / legislation & jurisprudence
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United States