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[Comment] Insecticide-resistant malaria vectors must be tackled

Vector control with long-lasting insecticidal nets and indoor residual spraying accounts for most of the 1·3 billion fewer malaria cases and 6·8 million fewer malaria-related deaths attributable to declining transmission between 2000 and 2015.1–3 However, because resistance to pyrethroid insecticides has spread through African malaria vector populations, concerns over maintaining these gains have been widely voiced—but these are frequently disputed.4 The findings presented by Natacha Protopopoff and colleagues5 in The Lancet provide rigorous, long overdue, new evidence for those working in the field of malaria vector control.