05/16/2026
Please see the below information regarding the polio weekly update from the World Health Organization.
Officially reported WPV1 and cVDPV cases as of 12 May 2026
Wild poliovirus (WPV)
· Total global WPV1 cases in 2025: 52
· Total global WPV1: cases in 2026: 6 (compared with 10 for the same period in 2025)
The number of wild polio cases for 2026 as of May 12, 2026, is 6. There was 3 in Pakistan and 3 in Afghanistan.
The total number of wild polio cases for 2025 were 52. There were 31 in Pakistan and 21 in Afghanistan.
Circulating vaccine-derived poliovirus (cVDPV) cases
· Total global cVDPV cases in 2025: 240
· Total global cVDPV cases in 2026: 52 (compared with 50 for the same period in 2025)
Dear Colleagues,
Please find attached this week's global update slides as well as the weekly summary.
Poliovirus Weekly Update
13-May-2026, World Health Organization
New wild poliovirus isolates reported this week:
AFP cases: 0
Environment: 9
Others: 0
New cVDPV isolates reported this week:
AFP cases: 14
Environment: 0
Others: 3
Summary of new polioviruses this week:
Pakistan: nine WPV1-positive environmental samples
DR Congo: three cVDPV2 cases
Ethiopia: four cVDPV1 cases
Nigeria: six cVDPV2 cases
Sudan: one cVDPV2 case
See country sections below for more details.
Afghanistan
No WPV1 cases were reported this week. The total number of cases in 2026 is three (most recent case: 17 February 2026). The total number of cases in 2025 is 21.
No WPV1-positive environmental samples were reported this week (most recent positive environmental sample: 26 March 2026).
Pakistan
No WPV1 cases were reported this week (most recent case: 7 April 2026). The total number of cases in 2025 is 31. The total number of cases in 2026 is three.
Nine WPV1-positive environmental samples were reported this week, from Sindh, Balochistan, Punjab and Khyber Pakhtunkhwa, collected in April 2026 (most recent positive environmental sample: 14 April 2026).
Algeria
No cVDPV2-positive environmental samples were reported this week (most recent positive environmental sample: 11 January 2026).
Angola
No cVDPV2 case was reported this week. There have been 19 cases reported in 2025 and one in 2026 (most recent case: 20 January 2026).
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 26 June 2025).
Australia
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 13 April 2026).
Chad
No cVDPV2 cases were reported this week. The number of cVDPV2 cases in 2025 is 31. The number of cVDPV2 cases in 2026 is four (most recent case: 12 March 2026).
No cVDPV2-positive environmental samples were reported this week (most recent positive environmental sample: 04 February 2026).
No cVDPV3 case was reported this week. The number of cVDPV3 cases for 2025 is four (most recent case: 18 October 2025).
DR Congo
No cVDPV1 case was reported this week. The number of cVDPV1 cases from 2025 is one (onset of paralysis: 25 June 2025).
Three cVDPV2 cases were reported this week, from Maniema, with onsets of paralysis on 19, 22 and 26 March 2026. The number of cVDPV2 cases in 2025 is six. The number of cVDPV2 cases in 2026 is nine (most recent case: 26 March 2026).
Ethiopia
Four cVDPV1 cases were reported this week, from Gambella, with onsets of paralysis in February and March 2026 (most recent case: 9 March 2026). These cases are genetically linked to cVDPV1 cases reported this year from South Sudan.
No cVDPV2 case was reported this week. The total number of cases reported in 2025 is 40 (most recent case: 7 October 2025).
Malawi
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 23 March 2026).
Namibia
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 3 March 2026).
Nigeria
Six cVDPV2 cases were reported this week, from Jigawa, Zamfara, Niger and Kaduna, with onsets of paralysis in March and April 2026. The total number of cVDPV2 cases reported in 2025 is 66. The total number of cVDPV2 cases reported in 2026 is 23 (most recent case: 17 April 2026).
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 6 April 2026).
No cVDPV3 cases were reported this week. The total number of cVPDV3 cases in 2025 is seven. The total number of cVDPV3 cases in 2026 is three (most recent case: 29 March 2026).
Somalia
No cVDPV2 case was reported this week. There are three cases reported in 2026 (most recent case: 20 February 2026). There have been two cases reported in 2025.
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 10 March 2026).
South Sudan
No cVDPV1 cases were reported this week. There are two cVDPV1 cases reported in 2026 (most recent case: 15 February 2026).
Sudan
One cVDPV2 case was reported this week, from Central Darfur, with onset of paralysis on 14 December 2025. There have been 13 cases reported for 2025. There is one case reported for 2026 (most recent case: 20 January 2026).
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 28 February 2026).
Togo
No cVDPV2 case was reported this week. There are two cases reported in 2026 (most recent case: 20 February 2026).
United Kingdom (UK)
No cVDPV2-positive environmental sample was reported this week (most recent positive environmental sample: 3 March 2026).