A new tool to fight the world’s deadliest animal—the malaria-carrying mosquito—may soon become more widely available.
in areas with pyrethroid resistance. “The fact that the trials showed very similar, really strong evidence, gives the WHO more freedom to strongly recommend these nets,” says Corine Ngufor, an entomologist at the London School of Hygiene & Tropical Medicine who helped lead the study in Benin.
Chlorfenapyr was first introduced in the United States in 2001 for use on nonfood crops in greenhouses, but it is not allowed to be sprayed on fields because it can be toxic to birds and aquatic animals. Its use in bed nets, however, is considered environmentally safe because the treated nets hang indoors and have limited contact with the wider environment.
As the nets are rolled out, it will be important to use techniques that can slow the development of resistance to chlorfenapyr, Ngufor says. That might mean combining the use of the new nets with indoor insecticide spraying or alternating the use of IG2 nets with pyrethroid-PBO nets for a few years at a time. Resistance to chlorfenapyr is certain to emerge at some point, she says. “We need to find ways to manage that.
France Dernières Nouvelles, France Actualités
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