Dynamique of prevalence and infection intensity of S . mansoni in a 5-year cluster randomized trial among 9- to 12-year-old children in Côte d’Ivoire, stratified by intervention arm.

(A): Variation of S . mansoni prevalence among children aged 9–12 years over time per village and by arm. Each line represents a village and black line represents the overall prevalence of the arm. (B): Variation of arithmetic mean intensity of S . mansoni per village over year by arm. Each line represents a village and black line represents the overall prevalence of the arm. Arm 1: praziquantel treatment every year; Arm 2: praziquantel treatment only in the first two years, followed by two years whithout treatment; Arm 3: praziquantel treatment every other year without treatment in-between.