Indoor Residual Spraying

Indoor residual spraying (IRS) involves spraying insecticide that’s safe for humans but kills mosquitoes on the walls and ceilings of homes—and sometimes in other structures such as schools, hospitals, prisons, or refugee camps. IRS is a proven, effective intervention in malaria vector control. The U.S. President's Malaria Initiative (PMI) Evolve Project supports national malaria programs (NMPs) with the planning, management, monitoring and evaluation of IRS campaigns. The World Health Organization recommends communities should reach a minimum spray coverage—percentage of structures sprayed over the total number of structures—of at least 85 percent to be effective.

PMI Evolve works with NMPs to plan for IRS campaigns using different models depending on each country’s situation, circumstances, and needs in a target area. This adaptive approach allows the project to reach the most vulnerable populations while maximizing IRS coverage rates and optimizing costs. Various models work differently across activities that include trainings, micro-planning, community mobilization, supervision, environmental compliance, logistics, and financial management.