title: [Studies on new attenuated strains of type I live poliovirus vaccine. II. Investigation on a series of field trials with "Zhong I9" strain].
mesh_terms: D000293:Adolescent; D000914:Antibodies, Viral / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D017955:Poliovirus / Q000302:isolation & purification; D011054:Poliovirus Vaccine, Inactivated / Q000009:adverse effects / Q000276:immunology*; D014613:Vaccines, Attenuated / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D011054:Poliovirus Vaccine, Inactivated; D014613:Vaccines, Attenuated