title: Sabin, Salk, or sequential?
authors.affiliation: World Health Organization, Geneva, Switzerland.
authors.forename: H F
authors.initials: HF
authors.lastname: Hull
authors.forename: J W
authors.initials: JW
authors.lastname: Lee
mesh_terms: D006801:Humans; D017589:Immunization Programs; D007115:Immunization Schedule; D011051:Poliomyelitis / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral; D014481:United States; D014492:United States Public Health Service; D014944:World Health Organization
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral