title: Pox precursors.
authors: Nigel
authors: N
authors: Williams
mesh_terms: D000818:Animals; D002417:Cattle; D015605:Cowpox / Q000266:history* / Q000276:immunology / Q000517:prevention & control; D004739:England; D005260:Female; D049672:History, 19th Century; D006801:Humans; D008297:Male; D012899:Smallpox / Q000266:history* / Q000276:immunology / Q000517:prevention & control; D012900:Smallpox Vaccine / Q000266:history*; D014611:Vaccination / Q000266:history*
chemical_list: D012900:Smallpox Vaccine