New wild poliovirus isolates reported this week:
AFP cases: 1
Environment: 7
Others: 0
New cVDPV isolates reported this week:
AFP cases: 3
Environment: 5
Others: 0

Summary of new poliovirus cases and positive environmental samples reported the past week:
Afghanistan: No WPV1 cases and no WPV1 positive environmental samples
Pakistan: One WPV1 cases and seven WPV1 positive environmental samples
Benin: One cVDPV2 case
Chad: One cVDPV2 positive environmental sample
Djibouti: One cVDPV1-positive environmental sample and two cVDPV2-positive environmental samples
Ethiopia: One cVDPV2 case
Tanzania: One cVDPV2-positive environmental sample
Yemen: One cVDPV2 case

Officially reported WPV1 and cVDPV cases as of (May 27, 2025):
Wild poliovirus (WPV)
Total global WPV1 cases in 2025: 14 (2 in Afghanistan and 12 in Pakistan)
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: 77
Total global cVDPV cases in 2024: 320
Total global cVDPV cases in 2023: 528
Total global cVDPV cases in 2022: 878

Other Polio news:

• Most recently reported WPV1 cases this year: March 9th in Afghanistan and May 14th in Pakistan.

• Over 60,000 polio vaccine refusals reported during April nationwide campaign in Pakistan. The reluctance to vaccinate remains a significant hurdle in Pakistan’s battle against polio. Pakistan has faced vaccine hesitancy and misinformation campaigns which have slowed progress in eradicating the disease. Northern Pakistan has reported its first Polio case in almost seven years, detected in a 23-month-old child. The case was reported after a polio eradication team came under fire from unknown armed men. Since the 1990s, attacks on polio vaccination teams in the country have killed over 200 workers and security personnel.

• The United States has been included in the World Health Organization’s latest notice regarding a Public Health Emergency of International Concern due to polio detections. A sequencing analysis in 2022 confirmed the presence of poliovirus in a total of 100 positive samples, providing evidence that the unvaccinated individual in Rockland County, New York with paralytic polio contracted the virus through local transmission. The inactivated poliovirus vaccine (IPV), the only polio vaccine administered in the U.S., protects approximately 99% of individuals who receive all recommended doses.
• WHO Director-General’s keynote speech at the 116th Rotary International Convention

Thanks to PRID Floyd Lancia and PDG Mike Groom for the periodic updates.