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Minimum population immunity to transmission of each WPV serotype at tOPV or OPV13 cessation to prevent a subsequent homotypic cVDPV outbreak in the hypothetical population with an R0 for WPV1 equal to 13*.*R0 for WPV2 = 0.9 × R0 for WPV1 (i.e., 0.9 × 13=11.7) and R0 for WPV3=0.75 × R0 for WPV1 (i.e., 0.75 ×13=9.75)
