title: [Studies on new attenuated strains of type I live poliovirus vaccine. I. Development of Zhong I9 strain].
mesh_terms: D000818:Animals; D008253:Macaca mulatta; D017955:Poliovirus / Q000528:radiation effects; D011054:Poliovirus Vaccine, Inactivated / Q000276:immunology*; D014613:Vaccines, Attenuated / Q000276:immunology
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D014613:Vaccines, Attenuated