Household sensitization and marking of study nets
Households and nets for both cohorts of the durability study will be drawn from the selected clusters of each arm of the cRCT using the ITN distribution list of the trial. Within the first month after ITN distribution, field workers will visit the selected households for each cohort of ITNs to recruit and mark study nets available in them. The number of households enrolled will be increased until the ITN sample size for each cohort is achieved (750 for cohort 1 and 1800 for cohort 2). Using a wash resistant marker, a unique code will be written on the study net to indicate the study arm, cluster ID, household ID and the cohort to which it belongs. During this visit, the durability study will be explained to the householders in their local language and the study team will assist them in hanging up their nets if needed. Only nets which have been successfully hung up and are in use in selected households at the start of the trial will be included in the durability study. GPS coordinates and characteristics of each household (housing type and socio-economic characteristics) included in the durability assessment will also be recorded.