title: Eradication of smallpox and elimination of poliomyelitis: contrasts in strategy.
mesh_terms: D002648:Child; D003906:Developing Countries; D006801:Humans; D011051:Poliomyelitis / Q000517:prevention & control*; D012899:Smallpox / Q000517:prevention & control* / Q000635:transmission; D014611:Vaccination