title: US changes polio vaccination programme.
authors.forename: D
authors.initials: D
authors.lastname: Johnson
mesh_terms: D006801:Humans; D007115:Immunization Schedule; D011051:Poliomyelitis / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated; D014481:United States; D014611:Vaccination
chemical_list: D011054:Poliovirus Vaccine, Inactivated