In its most recent weekly report, the Global Polio Eradication Initiative (GPEI) noted that three nations, Chad, the Democratic Republic of the Congo (DRC), and Mozambique reported additional polio cases, all of which were vaccine-derived strains. 

Chad reported a case of the circulating vaccine-derived poliovirus type 2 (cVDPV2), increasing its 2023 total to five.

The various cases reported were: WPV1 positive environment sample: Afghanistan cVDPV1 positive environment sample: Madagascar cVDPV1 case: Mozambique & Democratic Republic of Congo cVDPV2 positive environment sample: Algeria, Burundi, Nigeria & Benin cVDPv2 case: Chad & Democratic Republic of Congo.