title: Immunizations: three centuries of success and ongoing challenges.
authors.forename: Ricardo Becker
authors.initials: RB
authors.lastname: Feijó
authors.forename: Marco Aurélio P
authors.initials: MA
authors.lastname: Sáfadi
mesh_terms: D001938:Brazil; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007114:Immunization / Q000266:history*; D017589:Immunization Programs; D012900:Smallpox Vaccine / Q000266:history; D014612:Vaccines / Q000266:history*
chemical_list: D012900:Smallpox Vaccine; D014612:Vaccines