At close range, mosquitoes use visual cues and body warmth to seek their prey. But when they’re out of visual range — which could be a few dozen feet away — they are thought to track carbon dioxide and other chemicals found in body odor and breath.
To find out how these mosquitoes stalk their sleeping victims, scientists built an outdoor testing arena about the size of two tennis courts, or 2,000 times the size of a typical laboratory setup. They let the mosquitoes acclimate to their open-air laboratory. Then, the researchers did everything they could to conjure the right mood.
“This study adds a lot,” said Leslie Vosshall, a neurobiologist and chief scientific officer of the Howard Hughes Medical Institute, whose laboratory recently discovered that skin chemistry determined whether people were mosquito magnets for a different species,Anopheles gambiaeThe study found that the mosquitoes were particularly attuned to the oily secretions that hydrate skin and protect it from microbes.
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