title: A public health bicentennary.
authors: R
authors: R
authors: Mathias
mesh_terms: D002170:Canada; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011634:Public Health / Q000266:history; D012899:Smallpox / Q000266:history* / Q000517:prevention & control; D012900:Smallpox Vaccine / Q000266:history*
chemical_list: D012900:Smallpox Vaccine