Study Finds Mosquito Nets Reduce Malaria Cases Despite Rising Insecticide Resistance

A new analysis of studies conducted across Africa and Asia has found that insecticide-treated mosquito nets (ITNs) remain highly effective in reducing malaria infections and related deaths. However, researchers have warned that growing insecticide resistance among mosquito populations could threaten the long-term success of one of the world’s most widely used malaria prevention tools.

The findings, published in the journal Infectious Diseases, are based on an assessment of 25 studies carried out in 12 countries, including India and China. Researchers examined data comparing communities that used insecticide-treated nets with those that did not. Of the studies reviewed, 19 focused on malaria incidence, while six analysed malaria-related mortality across multiple endemic regions in Africa and Asia.

According to the researchers, the analysis confirmed a significant protective effect of ITNs against malaria and reinforced their status as a cornerstone intervention in global malaria control efforts. In Asian countries, the use of insecticide-treated nets was associated with a 68 per cent reduction in malaria cases and an 18 per cent reduction in malaria-related deaths. In African countries, the intervention reduced malaria incidence by between 29 and 40 per cent, demonstrating substantial public health benefits.

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Lead author Gbeminiyi Otolorin said the findings highlight both the effectiveness of ITNs and the need for continued vigilance. He warned that mosquitoes are increasingly developing resistance to commonly used insecticides and adapting their behaviour, which could reduce the effectiveness of mosquito control measures in some regions. Researchers noted that a strategy successful in one location may not perform equally well elsewhere due to changing environmental and biological factors.

The study also found that variations in mosquito species, levels of insecticide resistance, and community adherence to proper net usage can significantly influence outcomes. These local differences were particularly evident in parts of Asia, where effectiveness varied considerably between studies. Such findings underscore the importance of ongoing surveillance and region-specific approaches to malaria prevention and control.

To address emerging challenges, researchers recommended the adoption of next-generation insecticide-treated nets, including those incorporating multiple active ingredients designed to overcome resistance. They also called for integrated vector management strategies combining mosquito nets with measures such as indoor residual spraying and insecticidal wall treatments. Experts say these combined approaches will be essential for sustaining progress toward reducing malaria transmission and achieving long-term disease elimination goals.

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