[Letter: Vaccinations].
D000328:Adult; D000367:Age Factors; D000937:Antigen-Antibody Reactions; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D012899:Smallpox / Q000517:prevention & control; D013997:Time Factors; D014611:Vaccination
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