Wild poliovirus type 2 (WPV2) was declared eradicated in September 2015. Since then paralysis associated with type 2 poliovirus has continued mainly due to vaccine derived polio viruses (VDPVs) from type 2 OPV (OPV2). Due to the continued threat of paralysis from a mutated, neurovirulent and vaccine-derived type 2 poliovirus, the Strategic Advisory Group of Experts on Immunization (SAGE), a global advisory committee on immunization, recommended a phased cessation of OPV starting with OPV2. By May 2016, OPV2 was successfully withdrawn globally when trivalent OPV (tOPV) was replaced with bivalent OPV (bOPV), which was preceded by a phased introduction of inactivated poliovirus vaccine (IPV). SAGE has recommended at least one dose of IPV at age ≥14 weeks because IPV immunogenicity is expected to be highest after maternal antibodies have declined by age 14 weeks. However, studies have not assessed if priming after one IPV dose declines over time.