The mosquitoes are suspected to be behind a recent rise in malaria in Djibouti, prompting the World Health Organization to try to stop the insects from spreading further in Africa.
They didn't find many of the mosquitoes that usually spread malaria in Africa. Instead, they found high densities of the invasive mosquitoes. Tadesse and colleagues concluded the invasive mosquitoes were “strongly linked” to the outbreak.
He said most malaria spread in Africa has been in rural areas, as native mosquitoes don’t usually like breeding in polluted cities or artificial containers like buckets. But the invasive mosquitoes can thrive in such conditions. Still, Churcher said patchy surveillance means scientists don’t know how common the invasive mosquitoes are or how much malaria they’re causing.
“We are very worried,” he said, saying that until recently, Ethiopia had seen a big drop in malaria. “What we are seeing now is a significant increase.”
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