Summary of new polioviruses this week, cases and positive environmental isolates:
Algeria: one circulating vaccine-derived poliovirus type 2 (cVDPV2)-positive environmental sample
Egypt: one cVDPV2-positive environmental sample
Niger: one cVDPV2-positive environmental sample
Nigeria: four cVDPV2 cases and two cVDPV2-positive environmental samples
Sudan: two cVDPV2-positive environmental samples
