Fig. 3.

M. perstans infections are prevalent in ERF but not savanna areas. To determine the baseline prevalence (a) and intensity (b) of M. perstans infection prior to MDA in South West and eastern districts of Cameroon, individuals were screened in savannah (n = 3,073) and ERF (n = 2,648) zones that were yet to begin MDA programmes. Prevalence (c) and associated mf counts (d) were then assessed in GS, MFS and FS savannah districts and DERF and DHERF forest districts. Data were then further examined on an individual district level: Nkambe, GS (8 communities/n = 1,167); Kumbo, MFS (8 communities/n = 878); Mamfe, DERF (7 communities/n = 818) and DHERF (9 communities/n = 640); Lolodorf, DHERF (4 communities/n = 290), Batouri, DHERF (9 communities/n = 900); Nwa, FS (10 communities/n = 1,028). Statistical significance of the differences between groups indicated by the brackets were obtained after ANOVA/Kruskal-Wallis or Student's t-test or Mann-Whitney analysis depending on the normal distribution of the data