Every backyard gathering in South Florida seems to have one person who spends the whole evening slapping at their ankles while everyone else sits comfortably a few feet away. If that person is usually you, you have probably wondered whether you are imagining it, or whether mosquitoes really have singled you out.
They really have. Research over the past several years has shown that some people are consistently more attractive to mosquitoes than others, and the difference is not random. It comes down to a handful of signals your body gives off, a few of which you can influence and most of which you cannot.
What the evidence says
Some people are genuinely more attractive to mosquitoes, and research suggests that attractiveness stays fairly consistent for the same person over time.
Mosquitoes find people in stages. They detect carbon dioxide from a distance, then body heat as they get closer, then the odor of your skin up close.
The chemistry on your skin appears to be one of the strongest factors, and it is largely outside your control.
The popular blood type explanation is widely repeated, but the evidence behind it is weak and inconsistent.
The most convincing evidence comes from a 2022 study by researchers at Rockefeller University, published in the journal Cell. They tested how strongly the yellow fever mosquito, Aedes aegypti, was drawn to the scent of different volunteers, and found that some people were dramatically more attractive than others.
What made the result striking was its consistency. The most attractive volunteers stayed the most attractive across repeated tests, which suggests that being a mosquito magnet is a fairly stable trait rather than something that changes from week to week. The researchers linked the difference to the chemistry of the volunteers' skin, which we come back to below.
Mosquitoes do not find people by sight alone. According to the CDC, mosquitoes use a combination of carbon dioxide, body heat, and odor to locate the people they bite, and each signal works at a different range.
Carbon dioxide, from a distance.
Every breath you exhale carries carbon dioxide, and mosquitoes can sense it well before they reach you. People who exhale more, which tends to include larger people and anyone breathing harder, give off a stronger signal. This is one reason adults often get bitten more than small children.
Body heat, as they get closer.
Once a mosquito is near, warmth helps it home in. Someone running warm, flushed from the sun, or just back from a walk stands out more than someone who has been sitting still in the shade.
Skin odor, up close.
At the final stage, the smell of your skin decides whether the mosquito lands. This is where people differ most, and it is the factor behind the consistent results in the Rockefeller study.
Exercise turns up all three at once. You breathe harder, your body temperature rises, and you sweat, which releases lactic acid and other compounds mosquitoes are drawn to. That combination is why a run or a round of yard work in the evening can feel like an invitation.
Pregnancy appears to have a similar effect. Some research has found pregnant women to be more attractive to mosquitoes, likely because they exhale more carbon dioxide and run slightly warmer.
Your skin is home to a large community of bacteria, and together with your own body chemistry they produce a distinctive mix of odors. Mosquitoes read that mix closely.
The Rockefeller researchers found that the most attractive volunteers had higher levels of certain fatty acids, known as carboxylic acids, on their skin. These compounds are produced naturally and vary from person to person, which helps explain why two people sitting side by side can have completely different experiences.
The frustrating part is that this is mostly not something you can change. It is shaped by your genetics and the particular bacteria living on your skin, so it tends to stay with you.
You have probably heard that mosquitoes prefer people with type O blood. It is one of the most repeated explanations online, and it deserves more caution than it usually gets.
A few small studies have suggested a preference for type O, but the results have been inconsistent and have not held up reliably when others tried to repeat them. Mosquitoes also cannot sense your blood type directly before they bite, so any effect would have to work through some other signal on the skin. For now, it is best treated as unproven rather than as the reason you get bitten.
Clothing makes a modest difference. Research suggests that mosquitoes, once they have picked up on carbon dioxide, are more drawn to darker colors and certain bright hues than to lighter ones.
Loose, light-colored clothing that covers more skin is a reasonable choice in the evening, both because it may be less attractive and because covered skin is simply harder to bite.
Beer.
A small number of studies have found that drinking beer slightly increased how attractive people were to mosquitoes. The effect was modest and the studies were small, so it is a real possibility rather than a firm rule.
Perfume and scented lotion.
Mosquitoes feed on plant nectar as well as blood, and some floral or fruity scents may draw them in. The evidence here is limited, but switching to unscented products on evenings outdoors costs nothing and may help a little.
Showering.
Washing removes sweat and some of the odor compounds on your skin, so a shower after exercise can make you less attractive for a while. It does not change your underlying skin chemistry, though, so the effect fades as those compounds build back up.
Since most of what makes you attractive is out of your control, the practical answer is to block the bite rather than change yourself. The CDC recommends EPA-registered insect repellents as the most reliable personal protection, along with covering exposed skin.
The other half is reducing how many mosquitoes are around you in the first place, which brings it back to the yard.
Much of the research above focused on Aedes aegypti, which happens to be one of the most common mosquitoes around South Florida homes. It bites during the day rather than mainly at dusk, so staying indoors at sunset does less to avoid it than people expect.
It also breeds in small containers of water close to houses, which means the mosquito biting you is very likely coming from your own yard or a neighbor's. Our article on dengue in Florida this year covers this species in more detail, and our bromeliad guide covers one of the most overlooked places it breeds.
You cannot change your skin chemistry, but you can reduce the number of mosquitoes breeding around your home. We inspect for standing water and treat the shaded areas where adult mosquitoes rest. Wise House Pest Control offers a free inspection across Palm Beach County, Martin County, and St. Lucie County.
1177 Hypoluxo Rd Suite C-31 Lantana, FL 33462
464 NW Peacock Blvd, Unit 106 Port St Lucie, FL 34986
