 2.5.2 Study Design: The trial will be conducted over 30 months with 1 month of preparation, 9 months baseline before the intervention start, and 20 months of intervention year. IRS will be applied at the beginning of the intervention period in February-March 2015 before the increase of mosquito density indication the start of the long transmission period. The two types of LLIN shall be distributed according to cluster randomisation at the same period of the first round of IRS to ensure that at least 80 of the households will have one or more LLIN for every two people. 