title: Announcing sequential OPV-IPV schedule.
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage* / Q000009:adverse effects*; D017410:Practice Guidelines as Topic; D014481:United States
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral