Sudan will resume immunising children against polio after detecting circulating vaccine-derived poliovirus type 2 (cVDPV2) in its waster water, as six other African countries have reported either cases or positive environmental samples over the past two weeks.

Mali and Nigeria reported one case each, Yemen reported three cases and Angola, Côte d’Ivoire and Sierra Leone reported positive environmental samples.

Sudan’s Federal Ministry of Health (FMOH) announced that it will launch a polio vaccination campaign next month after cVDPV2 was detected in six wastewater samples between last September and January.