New wild poliovirus isolates reported this week:
AFP cases: 0
Environment: 19
Others: 0
New cVDPV isolates reported this week:
AFP cases: 2
Environment: 6
Others: 4

Summary of new poliovirus cases and positive environmental samples:
Algeria: two cVDPV2 positive environmental samples were reported
Chad: two cVDPV2 cases and one positive environmental samples were reported
Nigeria: two cVDPV2 positive environmental samples were reported
Senegal: one cVDPV2 positive environmental samples was reported

Afghanistan: No WPV1 cases and no WPV1 positive environmental samples were reported this past week.
Pakistan: No WPV1 cases and nineteen WPV1 positive environmental samples were reported this past week

Officially reported WPV1 and cVDPV cases as of (April 1, 2025):
Wild poliovirus (WPV)
Total global WPV1 cases in 2025: 7
Total global WPV1 cases in 2024: 99
Total global WPV1 cases in 2023: 12
Total global WPV1 cases in 2022: 30
Total global WPV1 cases in 2021: 6
Total global WPV1 cases in 2020: 140
Circulating vaccine-derived poliovirus (cVDPV) cases
Total global cVDPV cases in 2025: 15
Total global cVDPV cases in 2024: 308
Total global cVDPV cases in 2023: 528
Total global cVDPV cases in 2022: 878

Most recently reported WPV1 cases this year: January 27th in Afghanistan and February 10th in Pakistan.

World Immunization week is April 24th – April 30th. This is a critical time to raise awareness about the importance of immunization and the safety and effectiveness of vaccines.