evidence: - Inactivated polio vaccine (IPV) – protects against poliovirus types 1, 2, and 3 - Trivalent oral polio vaccine (tOPV) – protects against poliovirus types 1, 2, and 3 - following the "OPV Switch" in April 2016, tOPV is no longer in use - Bivalent oral polio vaccine (bOPV) – protects against poliovirus types 1, and 3 - Monovalent oral polio vaccines (mOPV1, mOPV2 and mOPV3) – protect against each individual type of poliovirus, respectively [...] In May 2012, the World Health Assembly declared the completion of polio eradication a programmatic emergency for global public health and the Polio Eradication and Endgame Strategic Plan 2013-2018 was developed and, in November 2012, endorsed by SAGE. Under objective 2 of the Eradication and Endgame Plan, at least one dose of inactivated poliomyelitis vaccine (IPV) should be introduced into all routine immunization programmes globally, and trivalent oral polio vaccines (tOPV) will be replaced with bivalent (bOPV) in all OPV-using countries. The global "OPV Switch" was successfully conducted worldwide in April 2016 – setting the stage for the eventual withdrawal of all OPV. [...] Anand A, et al. Vaccine, 2015 Nov 27;33(48):6816–6822. - Priming after a Fractional Dose of Inactivated Poliovirus Vaccine