Fig. 1

Impact of SIA intensity on cVDPV outbreaks after OPV2 cessation and OPV13 cessation showing the total paralytic incidence (i.e., including paralysis from OPV-related viruses in all reversion stages) in a block with a cVDPV outbreak in the event of insufficient homotypic OPV SIA. a Paralytic incidence due to serotype 2 polioviruses after OPV2 cessation in 2016, with or without tOPV intensification. b Paralytic incidence due to serotype 1 polioviruses after OPV13 cessation in 2019, for different scenarios of SIA frequency between January 1, 2017