The smallpox legacy: a history of pediatric immunizations.
Gregorio
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D002648:Child; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D012899:Smallpox / Q000266:history*; D012900:Smallpox Vaccine / Q000266:history*; D014611:Vaccination / Q000266:history*; D014944:World Health Organization / Q000266:history
D012900:Smallpox Vaccine