The Africa Indoor Residual Spraying Project (AIRS), led by Abt Global and funded by the United States President’s Malaria Initiative(PMI)/United States Agency for International Development (USAID) protects millions of people in Africa from malaria by spraying insecticide on the walls, ceilings, and other indoor resting places of mosquitoes that transmit malaria.

Dereje Dengela, Aklilu Seyoum, Bradford Lucas, and Benjamin Johns of Abt Global co-authored this article which  compiles data on the residual efficacy of insecticides used in Indoor Residual Spraying (IRS) campaigns in 17 African countries and compares observed length of efficacy to ranges proposed in World Health Organization (WHO) guidelines. Additionally, this study provides initial analysis on variation of mosquito mortality depending on the surface material of sprayed structures, country spray program, year of implementation, source of tested mosquitoes, and type of insecticide.