Are Mosquitoes Attracted to a Certain Blood Type? What the Research Actually Says
If you’ve ever hosted a backyard cookout and spent the entire night swatting at your legs while everyone else relaxed bite-free, you’ve probably asked yourself the same question: Why me?
It can feel like mosquitoes are targeting you on purpose — hovering around your chair, ignoring everyone else and turning you into the main course. The frustrating part is, you’re not imagining it.
Some people really are more attractive to mosquitoes than others. And yes, your blood type might play a role — but it’s only one piece of a much bigger puzzle.
Are mosquitoes attracted to a certain blood type?
This is the question most frustrated backyard hosts ask first — and the answer is annoyingly unclear. But some research does, in fact, suggest there is a connection.
A 2019 study in the American Journal of Entomology found mosquitoes showed a preference for Type O blood when given a choice between A, B, AB and O. A separate 2004 study reached a similar conclusion, with Type O individuals getting landed on more often, while Type A appeared less appealing.
So if you’ve ever felt like mosquitoes single you out… and you’re Type O, that might not be a coincidence. But not everyone in the scientific community is 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,” said Associate Professor Nigel Beebe of UQ’s School of the Environment, via The University of Queensland.
In other words: blood type might matter — but it’s far from the deciding factor.
Why it still feels like they’re targeting you
Even if blood type plays a role, mosquitoes aren’t checking your medical chart. They’re reacting to signals your body gives off — and some people naturally give off stronger ones.
In fact, a 2015 twin study in PLOS One found genetics may explain about 67% of mosquito attraction, meaning if you’re the one getting swarmed, there’s a good chance it runs in the family.
So yes — you can blame your parents.
What attracts mosquitoes (more than blood type)
If you want the real answer to what attracts mosquitoes, it comes down to how you smell, breathe and even what you wear.
Here’s what makes you a prime target:
- Your breath (carbon dioxide). Mosquitoes track CO₂ from up to 120 feet away. The more you exhale — whether you’re exercising, pregnant or drinking alcohol — the easier you are to find, per Our Blood Institute.
- Your sweat and body chemistry. Compounds like lactic acid, ammonia and uric acid (found in sweat) are major attractants, according to USA Today. Diet, hygiene and genetics all influence this.
- Your body heat. Mosquitoes go for warm areas — your head, neck and anywhere you’re flushed. If you run hot, you’re easier to locate.
- Your clothes. According to University of Washington researcher Jeffrey Riffell (via Time), mosquitoes are drawn to darker colors like black, navy, red and orange. Lighter colors like white, green and gray are less attractive.
- Pregnancy. A 2000 study found pregnant women were twice as likely to attract malaria-carrying mosquitoes.
- Your skincare and scent. Floral perfumes, deodorants and even certain moisturizers can make things worse.
“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,” Dr. Christopher Bazzoli said in an interview with the Cleveland Clinic.
Put all of that together, and you start to see why one person at the table gets 10 bites… and someone else gets none.
How to keep mosquitoes away (especially if you’re the target)
If you’re the one mosquitoes keep finding, the goal isn’t to change your blood type — it’s to reduce the signals you’re sending out.
Here are a few adjustments that can actually help:
- Wear lighter-colored clothing
- Skip strong perfumes and scented products
- Use unscented deodorant when possible
- Limit alcohol if you’re spending time outside
- Stay cool and dry (less sweat = fewer attractants)
And remember: only female mosquitoes bite — they need blood to develop eggs, according to Pfizer.
They find you using scent, sight and heat. And they often smell you before they ever see you. Mosquito antennae can detect carbon dioxide trails from up to 120 feet (40 yards) away, per USA Today.
The frustrating truth
If you’ve ever asked, “Why are mosquitoes attracted to me and not everyone else?” — the answer isn’t just one thing. It’s a mix of genetics, body chemistry, environment… and maybe a little bit of blood type.
And it gets worse.
“Unfortunately, they can learn,” Riffell told Time Magazine. “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.”
The upside? They can also learn to avoid you.
“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,” Riffell added.
So yeah — keep swatting.
This article was created by content specialists using various tools, including AI.
