Are You a Mosquito Magnet? The Surprising Reasons Mosquitoes Target Certain People
If you’ve ever stood beside a friend at a summer barbecue and walked away covered in welts while they remained untouched, you weren’t imagining things.
Mosquitoes really do play favorites — and the reasons reveal a fascinating tangle of genetics, body chemistry and evolutionary tracking that scientists are still untangling.
Here’s what researchers have discovered about why some people become a mosquito magnet while others slip through the night unnoticed.
Your genes may matter more than you think
A 2015 twin study published in PLOS One found that genetics may account for roughly 67% of mosquito attraction — comparable to how genetically linked height and IQ are.
Researchers had identical and fraternal female twins place their hands inside Y-shaped acrylic containers and watched where the mosquitoes went. Identical twins, who share exact genes, drew remarkably similar levels of mosquito interest.
Earlier research had already established that identical twins share more similar body odors, and odor is one of the most powerful signals a mosquito reads.
The blood type debate
The question of whether mosquitoes are attracted to a certain blood type has produced some of the most-cited — and most contested — research in the field.
A 2019 study in the American Journal of Entomology found mosquitoes preferred Type O blood when given access to feeders containing A, B, AB and O. A 2004 study similarly found mosquitoes were more likely to land on people with Type O blood, while those with Type A appeared less appetizing.
But the science is far from settled on what blood type mosquitoes are most attracted to. Associate Professor Nigel Beebe of the University of Queensland’s School of the Environment isn’t convinced.
“There’s no evidence to say that certain blood types — that is, certain antigens that sit on the outside of the red blood cell — influence a mosquito’s attraction to you,” Beebe told The University of Queensland.
Many researchers now argue skin odor and microbiota matter even more than blood type.
Breath, sweat and body heat
What attracts mosquitoes more reliably than blood type is carbon dioxide. Mosquito antennae can detect a CO2 trail from up to 120 feet away, USA Today reports. They smell you long before they see you.
People with higher metabolic rates — those exercising, drinking alcohol or pregnant — exhale more CO2 and become prime targets, according to Our Blood Institute.
A 2000 study on malaria-carrying mosquitoes found pregnant women were twice as likely to attract them as non-pregnant women.
Sweat seals the deal. Mosquitoes are drawn to lactic acid, ammonia and uric acid in perspiration, USA Today notes, along with skin concentrations of steroids, cholesterol and carboxylic acids.
Body heat finishes the job — mosquitoes home in on warm zones like the head and neck.
Color, perfume and the things we wear
If you’ve wondered why are mosquitoes attracted to me even when you’re standing still, look at your shirt.
Jeffrey Riffell, a biology professor at the University of Washington, told Time Magazine that mosquitoes respond to both scent and color. Black, navy, red, orange and cyan draw them in. White, green, purple, blue and gray tend to repel.
The Harrison County Health Department notes dark clothing resembles the shadows where mosquitoes hide.
The products we use to mask body odor often backfire. Floral perfumes and scented deodorants attract them. So do moisturizers containing lactic acid and anti-aging products with alpha-hydroxy acids.
“Mosquitoes are attracted to our body odor, but they’re also attracted to the things we use to mask it, such as perfumes or deodorants,” emergency medicine specialist Dr. Christopher Bazzoli told the Cleveland Clinic.
Why they bite — and how to keep mosquitoes away
Only female mosquitoes bite humans. They need blood protein to develop fertile eggs, according to Pfizer, and they remember who tasted good.
“If you are very attractive and they bite you and drink your blood, they will then go back to you because they learned this kind of positive association,” Riffell told Time Magazine. “The good news is that they can learn to avoid you, so if you’re trying to swat them they’ll learn that and they’ll avoid you a little bit.”
Knowing what mosquitoes are attracted to — heat, breath, sweat, dark clothing, scented skin — is the first step toward becoming forgettable.
This article was created by content specialists using various tools, including AI.
