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. 2022 Jan 21;71(3):85–89. doi: 10.15585/mmwr.mm7103a3

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This figure is a histogram that shows the number of wild poliovirus type 1 cases and circulating vaccine-derived poliovirus type 2 cases in Afghanistan during January 2020–November 2021. — Number of wild poliovirus type 1 cases (n = 60) and circulating vaccine-derived poliovirus type 2* cases, by month of onset of paralysis (n = 351) — Afghanistan, January 2020–November 2021^†

Abbreviations: cVDPV2 = circulating vaccine-derived poliovirus type 2; WPV1 = wild poliovirus type 1.

* cVDPVs are genetically linked VDPV2 isolates for which there is evidence of person-to-person transmission in the community.

^† Data as of January 11, 2022.