Child enrollment and follow-up. We enrolled a total of 1586 children in the KIDS-Malaria cohort: 1312 children during initial enrollment in May 2008, and 274 who aged into the study in subsequent years. Of these 1586 children, 1335 (84.2%) completed follow-up through the end of the 2011 transmission season. The major reasons for 251 children not completing follow-up were relocation (47.0%), attaining 18 years of age (24.3%), parental withdrawal (20.7%), and death from any cause (8.0%).