Fig. 2From: The detection of 3 ambiguous type 2 vaccine-derived polioviruses (VDPV2s) in UgandaEnhancing population OPV immunity following VDPV detection in Uganda. The rectangle represents the date of VDPV detection. The bars in different colors represent vaccination coverage in the various districts where the VDPVs were identified. In Kisoro district the intervention was performed in April 2016 following a risk assessment that was conducted before the detection of the VDPVBack to article page