title: Field trial on the efficacy of oral Sabin vaccine versus Salk polio vaccine.
mesh_terms: D002675:Child, Preschool; D002986:Clinical Trials as Topic; D004534:Egypt; D006801:Humans; D007114:Immunization; D007223:Infant; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral