Study Interventions: 2 arms: 1) Active comparator arm - single standard MDA with IVM (150 µg/kg) + albendazole (ALB;400 mg) soon after the beginning of the rainy season; 2) Experimental arm, single standard MDA with IVM (150 µg/kg) + ALB (400 mg) plus 5 more MDA with IVM alone (150 µg/kg) at 3 week intervals thereafter. Community health workers and trained by local health authority of the Sud-Ouest region will perform the first MDA in both arms with logistical assistance from the study investigators. Repeated MDAs will only occur in the experimental-arm villages, and be performed by the study investigators.