Fig. 1From: Detection and characterization of polioviruses originating from urban sewage in Yaounde and Douala, Cameroon 2016–2017Temporal pattern of the isolation of non-polio enteroviruses and vaccine polioviruses in the cities of Yaounde and Douala from January 2016 to December 2017. The number of individual virus types (SL1: Sabin type 1; SL2: Sabin type 2; SL3: Sabin type 3; NPEV: non-polio enterovirus) isolated and culture negative samples are indicated for each monthsBack to article page