26 February 2021 - Wits University A study by Wits scientists and partners has proved that a targeted malaria transmission prevention intervention is not inferior to the 'blanket' approach. Furthermore, the targeted Indoor Residual Spraying (IRS) intervention was safe, less costly, and more cost-effective compared with standard 'blanket' IRS, meaning savings could potentially be reallocated to other malaria control and elimination activities. IRS refers to the application of insecticide onto the interior walls of houses. The study, by the Wits Research Institute for Malaria (WRIM) and the London School of Hygiene and Tropical Medicine (LSHTM), was published in The Lancet on 25 February 2021.