Summary of new polioviruses this week, cases and positive environmental isolates:

• Pakistan: four WPV1 cases and 53 WPV1-positive environmental samples
• Algeria: two cVDPV2-positive environmental samples
• DR Congo: two cVDPV1 cases
• Ethiopia: one cVDPV2 case
• Niger: one cVDPV2 case and one cVDPV2-positive environmental sample
• Nigeria: seven cVDPV2 cases and one cVDPV2-positive environmental sample
• Senegal: one cVDPV2 case
• Yemen: two cVDPV2 cases