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Immunization Systems Management Group (IMG) milestones. Abbreviations: IPV, inactivated poliovirus vaccine; MDVP, multidose vial policy; OPV, oral poliovirus vaccine; SAGE, Strategic Advisory Group of Experts on Immunization; tOPV, trivalent OPV; UNICEF, United Nations Children’s Fund; WHA, World Health Assembly; WPV2, wild poliovirus type 2.
