 The study found that after three years, only 17% of the pyrethroid-long-lasting insecticidal nets, lins, distributed in sub-Saharan Africa, were still present in the homes where they had been distributed. This suggests that these nets may need to be replaced more frequently than previously thought. Additionally, the study found that the PBO lins were more protective against malaria than standard lins, despite having similar levels of pyrethroid content after three years. This article was authored by Elliot Lacolle, Jackie Cook, Jacqueline F. Masha, and others.