Fig. 2From: The differential impact of oral poliovirus vaccine formulation choices on serotype-specific population immunity to poliovirus transmissionPopulation immunity to transmission in northwest Nigeria for all 3 serotypes and different annual numbers of bOPV and tOPV SIAs. a Population immunity to serotype 1 poliovirus transmission. b Population immunity to serotype 2 poliovirus transmission. c Population immunity to serotype 3 poliovirus transmissionBack to article page