A Sprayer (IMAGE) UT Southwestern Medical Center Caption A sprayer applies one of the study interventions, reactive focal vector control (RAVC) with pirimiphos-methyl insecticide, on indoor walls of sleeping structures, to repel and kill mosquitoes in a Zambezi village in 2017. Credit Nana Kofi Acquah/Novartis Foundation Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.