Three countries have new polio cases this week, according to the latest weekly update from the Global Polio Eradication Initiative (GPEI).
Pakistan has one more wild poliovirus type 1 case, and Chad and Nigeria have more vaccine-derived cases.
In Pakistan, the case-patient experienced paralysis in late September in Balochistan. The country now has reported 49 polio cases this year.
Five circulating vaccine-derived polio type 2 (cVDPV2) cases were reported this week in Chad, from N’Djamena and Tandjile, with onsets of paralysis in August and September. The cases bring Chad’s 2024 total to 20.
Nigeria reported a single case of cVDPV2 in September and now has 81 cases for the year.
Detections in Poland, Spain were related
Of note, the GPEI also said an environmental sample in Poland shows cVDPV2, but there is no evidence of local circulation. The sample was obtained in October in Warsaw.
Initial analysis suggests it is linked to the cVDPV2 emergence originating in Zamfara, northern Nigeria, which has this year been detected internationally, including recently also in Barcelona, Spain.
"Initial analysis suggests it is linked to the cVDPV2 emergence originating in Zamfara, northern Nigeria, which has this year been detected internationally, including recently also in Barcelona, Spain," the GPEI said. "Poland has high vaccination coverage, estimated at above 90% with three doses of IPV, both national and in the affected subnational area."