In a new research paper, released [October 18], scientists from Rockefeller University found mosquitoes are drawn to people who secrete an odour on their skin caused by a mix of naturally occurring acids.
The scientists focused on the Aedes aegypti mosquito, which carries viruses that cause serious diseases such as yellow fever, dengue and Zika.
As part of their three-year study, the scientists carried out more than 2,330 tests over 174 days using samples of human forearm odour collected on nylon sleeves.
They found people who get ravaged by mozzies secrete significantly higher levels of ‘carboxylic acids’ from their skin than others, citing genetics as a factor.
The researchers suggested genetics may play a role in determining a person’s skin acid composition, and their susceptibility to getting bitten around a barbecue.
“Understanding why some humans are more attractive than others provides insights into what skin odorants are most important to the mosquito and could inform the development of more effective … repellents,” the paper said.
Dr Cameron Webb, a mosquito researcher at the University of Sydney, said there were lots of reasons why someone might get bitten by mosquitoes more than another.
“It can be to do with your genetics, and how that determines the mix of chemicals on your skin,” he said.
“But also your activity, whether you’re hot or cold, sweaty, pregnant, and maybe to a certain extent, your diet.”
