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Number of circulating vaccine-derived poliovirus (cVDPV) cases detected, by serotype — worldwide, 2000–2019*
Abbreviations: cVDPV1 = circulating type 1 VDPV; cVDPV2 = circulating type 2 VDPV; cVDPV3 = circulating type 3 VDPV.
* Number of cases detected and reported as of September 10, 2019.
