Certain compounds in our skin determine how much we attract mosquitoes, new research suggests—and those compounds don’t change much over time
As you may have noticed, mosquitoes don’t attack everyone equally. Scientists have known that the pests are drawn to people at varying rates, but they have struggled to explain what makes certain people “mosquito magnets” while others get off bite-free.
Scientists have put forth some theories to explain why mosquitoes swarm to some of us more than others, including one idea that differences in blood type must be to blame. Evidence is weak for this link, however, Vosshall says. Over time, researchers began to coalesce around the theory that body odor must be a primary culprit in mosquito attraction. But scientists have been unable to confirm which specific odors mosquitoes prefer.
The researchers analyzed the subjects’ scent profiles to see what might account for this vast difference. They found a pattern: the most attractive subjects tended to produce greater levels of carboxylic acids from their skin while the least attractive subjects produced much less. “This property of being a mosquito magnet sticks with you for your whole life—which is either good news or bad news, depending on who you are,” Vosshall says.
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