title: Progress in immunization coverage.
mesh_terms: D003906:Developing Countries; D006801:Humans; D007231:Infant, Newborn; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage*; D014611:Vaccination / Q000706:statistics & numerical data
chemical_list: D011054:Poliovirus Vaccine, Inactivated