The baseline (pre-control) and final values for community microfilarial load. All data are for records that reported 10 or more years of ivermectin treatment with or without vector control. The shaded horizontal bands in A–F show baseline endemicity levels according to microfilarial prevalence, from hypoendemic (very light yellow) to holoendemic (dark yellow). The shaded bands in G–L indicate endemicity levels according to nodule prevalence, from hypoendemic (very light yellow) to hyperendemic (medium yellow). The grey lines indicate the individual records. The dark red lines represent the mean values at baseline on the vertical axis and at the end of the intervention period reported on the horizontal axis (in some articles, only baseline infection data were provided, while others reported duration of ivermectin mass drug administration was not accompanied by parasitological data at the end of the intervention period).