Cases of polio caused by wild poliovirus type1 and circulating vaccine-derived poliovirus type 2,* by province and period — Afghanistan, January 2021–September 2022†,§
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.
† Total cases by period: January–June 2021 = one WPV1 and 42 cVDPV2, July–December 2021 = three WPV1 and one cVDPV2, and January–September 2022 = two WPV1 and zero cVDPV2.
§ Data as of October 20, 2022.