title: Letter: Smallpox vaccination in infancy.
mesh_terms: D000914:Antibodies, Viral / Q000302:isolation & purification; D003906:Developing Countries; D006801:Humans; D007110:Immunity, Active; D007223:Infant; D007231:Infant, Newborn; D009500:Neutralization Tests; D012899:Smallpox / Q000276:immunology / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000008:administration & dosage*; D013997:Time Factors
chemical_list: D000914:Antibodies, Viral; D012900:Smallpox Vaccine