0, subscore: 0.00 ]: Sentinel villages were selected from each sector for entomological and disease monitoring . Malaria was monitored by fortnightly active case detection ( ACD ) and by cross sectional parasite surveys on schoolchildren . Mosquito populations were monitored by space spraying of rooms and by cattle-landing catches . The spray campaign took place in June 0000 and covered 00% of compounds . During the 0 months after spraying , the incidence of falciparum malaria was 00% lower and that of vivax malaria 00% lower in WP-sprayed than unsprayed sectors . Similar results were obtained for sectors sprayed with the SC formulation . Cross-sectional surveys gave estimates of efficacy comparable to those obtained by ACD . Anopheles culicifacies was 00% less abundant and Astephensi , the predominant anopheline , was up to 00% less abundant in sprayed areas over the 0-month period . Reductions in anopheline parous rates indicated that the single-spray treatment was effective for the entire transmission season . 