title: Letter: Antibodies to poliovirus and measles virus.
mesh_terms: D000914:Antibodies, Viral / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008459:Measles virus / Q000276:immunology*; D017955:Poliovirus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral