NEW YORK -- A new study finds that some people really are "mosquito magnets" and produce a lot of certain chemicals on their skin that are tied to the way they smell.
In bad news for mosquito magnets, researchers say the bloodsuckers stay loyal to their favorites over time, researchers say.
"If you have high levels of this stuff on your skin, you're going to be the one at the picnic getting all the bites," said Leslie Vosshall, study author and neurobiologist at Rockefeller University in New York.
To put mosquito magnetism to the test, the researchers designed an experiment pitting people's scents against each other, study author Maria Elena De Obaldia said. Their findings were published Tuesday in the scientific journal Cell.
They asked 64 volunteers to wear nylon stockings around their forearms to pick up their skin smells. The stockings were put in separate traps at the end of a long tube, then dozens of mosquitos were released.
"They would basically swarm to the most attractive subjects," De Obaldia said. "It became very obvious right away."
Scientists held a round-robin tournament and ended up with a striking gap: The biggest mosquito magnet was about 100 times more attractive to the mosquitoes than the last place finisher.
The experiment used the Aedes aegypti mosquito that spreads diseases like yellow fever, Zika and dengue. Vosshall said she'd expect similar results from other kinds, but would need more research to confirm.
Out of the favorites, the researchers found a common factor: Mosquito magnets had high levels of certain acids on their skin.
These "greasy molecules" are part of the skin's natural moisturizing layer, and people produce them in different amounts, Vosshall said. The healthy bacteria that live on the skin eat up these acids and produce part of our skin's odor profile, she said.
You can't get rid of these acids without damaging your skin health too, said Vosshall, who is paid by the Howard Hughes Medical Institute and serves as its chief scientific officer. The institute also supports The Associated Press' Health and Science Department.
But the research could help find new methods to repel mosquitoes, said Jeff Riffell, a neurobiologist at the University of Washington who was not involved with the study. There may be ways to tinker with skin bacteria and change humans' tantalizing smells, he said.