Newly detected cases by moment of detection (
before intake, at intake, first follow up or second follow up) in four sample group areas. Compounds are depicted by a black dot. The dash-dotted (⋯-) line indicates the village or ward border. Other lines indicate roads, canals and river embankments. Compounds outside these borders are not included in the study, but some are shown on the maps to indicate the closeness of other villages.