The Strategic Advisory Group of Experts on Immunization (SAGE) provides technical oversight for all GPEI global policy decisions on immunization, and provides advisory and oversight on the work against Objective 2 of the Polio Endgame Plan – immunization systems strengthening and OPV withdrawal. The SAGE provides guidance to the WHA and informs the Polio Oversight Board. It is made up of acknowledged experts with a thorough understanding of immunization issues.

The SAGE Working Group on Polio advises SAGE, among other topics, on the role of inactivated polio vaccine (IPV) in routine immunization following oral polio vaccine (OPV) cessation.