title: Smallpox policy reversed.
mesh_terms: D002648:Child; D006801:Humans; D007115:Immunization Schedule; D007883:Legislation, Medical; D012899:Smallpox / Q000401:mortality / Q000517:prevention & control*; D006113:United Kingdom; D014611:Vaccination / Q000009:adverse effects / Q000401:mortality; D014944:World Health Organization