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Using a new bug spray on bed nets that blocks mosquitoes resistant to current insecticides almost halved malaria infections among children in Tanzania in a study that has boosted hopes of protecting more people from the killer disease.

A trial by the London School of Hygiene & Tropical Medicine involving 15,000 children found that using a bed net treated with piperonyl butoxide reduced malaria infections by 44 percent in the first year compared to nets only treated with pyrethroid.

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