Why do mosquitoes bite some people more than others?

- asks Allison from Austin

Credit: [Oxbow Park Naturalization Project].
By Meredith Knight | Posted September 10, 2007
Posted in: Ever Wondered?, Featured, Life Science

Every summer, they come. They sneak through the windows and ravage your ankles; they find the one spot on your left shoulder that didn’t get drenched in a layer of DEET (God bless you, Deep Woods Off!) and gnaw, chomp, and suck away.

From May to September, many of us – covered in scars and bloody scabs, the remnants of these bites now gone bad – live side-by-side with people who, despite living in the same house and even sleeping in the same bed, are seemingly less vulnerable to the vicious six-legged predators. It turns out, a mosquito’s snacking preference for one person over another is not just a curious annoyance, it’s also a medical concern: Since malaria and other diseases are transmitted by bites, people who get bitten a lot are more likely to become ill. Because of this, researchers are working to find the mechanisms in mosquitoes that cause them to sniff out you, and not your neighbor.

Scientists have identified several proteins found in mosquitoes’ antennae and heads that latch on to chemical markers, or odorants, emitted from our skin. These markers are produced by the natural processes of our bodies and, like neon signs, they let the mosquitoes’ smell center know you’re around (though the process that then guides them to you is not well understood). Flies and mosquitoes share a number of the same genes that dictate production of these odorant-binding proteins, which have specific sites that will catch or bind with certain chemicals in the air. Some scientists suggest that certain characteristics attract mosquitoes, thereby leading us to have more bites than others. Some of the top candidates: the amount of carbon dioxide in the breath, pregnancy, body temperature, alcohol and odorant markers based on blood type.

Blood-type markers are chemicals released by people of a specific blood type – so if someone with AB blood emitted a marker, it would be different than that released by B. One study found persons with Type O blood suffered more mosquito landings because of the odorant markers they emit than any other blood type, making their juices a hot commodity for blood banks, as well as Asian Tiger Mosquitoes, which carry West Nile Virus. Not only were Type O’s more likely to be landed on, but the study found that for any blood type, people who secreted a chemical marker about their blood type through their skin (both blood type and secretor status are determined by genes) were bitten much more than non-secretors; 24 percent in the case of the Type O’s. Other researchers estimate about 15 percent of the population, based on their genes, don’t emit chemical markers of their blood type through their skin and saliva, so something else has to be calling the mosquitoes to them.

Pregnancy seems to be a big winner for mosquito attraction, probably because mothers-to-be exhale 21 percent more carbon dioxide (quite a turn-on to the six-legged species) and are on average 1.26 degrees Fahrenheit warmer around the belly than their non-pregnant counterparts, due to the temperature of amniotic fluid. Also, having just 12 ounces of beer increases your mosquito appeal, possibly because of the increase in body temperature it causes or because skin markers change when metabolizing cocktails – unfortunate since outdoor drinking is a highlight of summer anywhere.

One researcher suggested smell is unimportant, and what really matters to the mosquito currently chomping on your toe is not the smells you’re giving off, rather it’s finishing her meal without being swatted away. Because of this, she’s better off attacking “less defensive” animals, rather than more defensive, and so is evolutionarily predisposed to biting lazy or incapacitated prey (reference drinking above).

Infectious disease experts are anxious to solve the mosquito preference puzzle so they can design repellants tailored to vulnerable people, which would either block an individual’s smell signatures or disarm a mosquito’s scent receptors. Unfortunately, a specific answer to your skin-piercing question continues to itch away at scientists, and I suggest stocking up on bug repellant in the meantime.

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  1. thank you for the article.now i can answer to some dumb people when they say i get bit by mosquitoes because of my body smell.i get so agravated!!!

    ana, May 26, 2008 at 12:17 am
  2. I just absolutely KNEW that frequency of bites had to do with blood type. I am type O and am ALWAYS getting eaten alive by mosquitos! Many of my friends that are type A NEVER get bitten, even when a mosquito lands on them!

    Jessica, July 17, 2008 at 6:49 pm
  3. Erm… I’m an O and I never get bitten!!

    Ritu, July 20, 2008 at 9:57 am
  4. My blood type is a+ and I am always getting bitten. I think it’s because I am so sweet. LOL

    paula, July 21, 2008 at 1:24 am
  5. I have a real problem with mosquitoes biting at my bag, is it possible my bag emits an odor that attracts mosquitoes?

    LOL this thread is messed. Mosquitoes bite people to live and feed their young, the numbers mean nothing and I would have to go with the chaos theory, in that someone has to be bit more than another and someone has to be bit less, otherwise the world would explode without randomness, or chaos.

    Wanna learn something that pertains to everything, check out chaos theory. Stats are pointless.

    Mike, July 23, 2008 at 9:17 pm
  6. Interesting, but my family totally blows the blood type theory. I have a daughter who is B+ who absolutely gets eaten alive and one who is A+ with a pretty strong attreaction. The rest of us who are A+ and O+ use the first two as our repellent.

    Liza, July 24, 2008 at 9:46 pm
  7. Last year i went on holiday, my brother aged 10 and my son aged 4 shared the same room my brother got bitten loads with repellent on and yet my son didn’t get one bite we used repellent on him the first couple of days, but after that he didn’t have any on as they didn’t seem to like him and he still didn’t get bitten. Im just intriged to know why???

    kelly, August 1, 2008 at 5:23 am
  8. Always knew it must be linked to blood type, not sure on the O type though, Im A- and always get bitten alive while no-one else does!!???

    Karen, August 1, 2008 at 12:55 pm
  9. Thank you for this article. now i have an answer to why mosquitoes bite me all the time instead of the other people in the same room as me. it’s only because of my rich thick blood type! and because of bodyly secretions that i give off. and my smell, and a whole lot of other things. thanks!

    Lexi, August 6, 2008 at 12:23 pm
  10. how about this…when i get bit by mosquitoes, which not only seems to be more than everyone i know, i get bitten in quick clusters. i don’t just get one generic bite here and there. i will get bit in repeated succession in a big cluster of sometimes four or five bites in a small area. no matter where i go, this holds true.

    Angel, August 8, 2008 at 3:55 am
  11. i am type O and i never get bit. i don’t think i’m buying the blood type theory. there are posts here of people all over the blood type spectrum and their experiences are just as widely ranged.

    renae, August 18, 2008 at 2:29 pm
  12. OMGGGGGG!!!!!!!!!!!!!!!!!
    I GET BITTEN BY mosquito all the time, and i have no idea what my blood type is.

    Katoni, August 31, 2008 at 12:48 am
  13. I am type O and get eaten alive even with repellant on. I also have a blood disease called ITP, and I wonder if they like me because my blood does not clot normally.

    Susan, September 2, 2008 at 11:00 am
  14. Interesting…but the photo above the article is not that of a mosquito but a (harmless) crane fly. it would be hard to bite someone, regardless of blood type, without a nice long proboscis (nasty bitey part).

    SH, September 6, 2008 at 1:31 pm
  15. I am blood type B+ and have been attacked by mosquitoes continuously all of my 70 plus years. I have applied many different types of repellants but as of yet have not found one that works well. I have attracted them in the American continent all areas and also in Asia. I am resigned to being bit as there isn’t much I can do about it, hopefully sience will discover the reason and develope a repellant.

    Bill Clark, September 15, 2008 at 10:55 am
  16. This information I just read is right. I have never been bitten by mosquitoes But now i have been drinking a couple of beers in the afternoon and I go out and i get bitten within minutes at least in four different places uncles ,elbows and ,knees .When I drank red wine it never happen

    Tony Radman, September 17, 2008 at 1:43 pm
  17. I am AB+ blood type and Im bitten by mosquitos ALL THE TIME! Im just so sick of it!! Even the repellants dont help me! Its terrible.
    However, besides the blood type, the article states that the body warmth and alcohoc composition are also factors of attraction! :(
    Thank you for the article!

    Ady, September 17, 2008 at 10:11 pm
  18. blood type? what about body temperature? I have a normal body temporature of 96.3sih rather then 98.6 and i never seem to get bit. might not this be the major factor? warmer people get bit and cooler people don’t….Possible?

    Galen, September 25, 2008 at 8:58 pm
  19. One thing the article mentioned is that not everyone emits the scent of their blood type. Which would explain why some people with a certain blood type get bitten and some don’t – they don’t excrete the scent.

    I get bitten constantly. My mom does too. On a recent vacation to a lake house I was outside just as frequently as 2 friends and my husband (who threatened to put me in a bubble!) – we all drank the same amount, wore bug spray, and were even using the same shampoo and soap. I went in every night covered in bites, while everyone else was untouched; including, luckily, my son.

    It is obnoxious. We just killed one in the house – it bit me 5 times before we could get it. Grrr…

    Body temp is interesting – I have a low body temperature of around 96.7, and I don’t remember bites being much of a problem when I was pregnant.

    Thanks for the article!

    Audrey, September 29, 2008 at 9:45 pm
  20. I live in a hot country and being constantly bitten is getting me down quite a lot.
    I now wear repellent every day and carry it with me. When i arrived 3 months ago i ended up scratching so much that the bumps and itching came up all over my arms and legs and stomach. It seemed like an allergic reaction to the bites but the doctor didn’t seem sure what had caused it. She said it was a food allergy or an allergic reaction to the bites. I think it was the latter.
    I have A type blood so that blood theory seems a bit off to me. My partner doesn’t get bitten very often, just now and then. Also my daughter gets quite a lot but not my son. Is it the female hormones that maybe attract them more or what?? The biggest annoyance is that i’ve been wearing trousers lately and get bitten on my legs so how the heck are they getting up my legs. I despise mosquitos. Why can’t they become extinct??

    Andrea, October 7, 2008 at 8:00 am
  21. I’m type O and used to get bitten a lot. Now that i’m older, i don’t get bitten as much. As it’s stated, 15 percent don’t emit the blood marker. But from what i’ve learnt, mosquitos are attracted to CO2 as well. So people that never get bit either don’t emit much CO2 or a blood marker or are move enough to keep them off.
    It states that type O are bitten more, but that could be the marker is more familiar as there’s more O around and is the oldest type.
    People that aren’t O but get bitten a lot, it could be you give off more CO2, emitted a higher blood marker or just really unlucky. I think i get bitten less because i weigh a lot more and my diet’s changed.

    Dark, October 8, 2008 at 2:14 am
  22. My wife and myself plus my sister in law and her husband have just returned from playa del carmen in Mexico. My wife and her sister are twins and have the same blood group as myself (A+). I have over 40 bites and my sister in law in excess of 30, my wife had NONE and my BIL 3 which were barely noticeable. In terms of alcohol my BIL drinks more than all of us and is blood group (O).

    I can’t comment on carbon dioxide levels but an certainly say neither my wife or SIl are pregnant … in short i’m none teh wiser just very itchy

    Mike, October 14, 2008 at 2:47 pm
  23. I live in Thailand and am relatively unaffected by mosquitoes – I notice though that most of my friends who are, take ineffective precautions. They claim all sorts of reasons and then go out in the evening in short sleeved shirts and no socks.
    They become obsessed with ridding a room of mosquitoes and then sleep without bedsheets……

    wilko, October 19, 2008 at 9:37 pm
  24. odorant marker emmited from the blood type..interesting..i always wondering why my mother’s always gets bitten instead of my father.. my mom always says that she has a sweeter blood than my father cause she’s the only one gets bitten.. but based on temperature it’s kind of opposite cause my father’s body temperature is higher than my mother ..

    ojyou, November 17, 2008 at 8:46 am
  25. I am blood type AB+ and prior to having a kidney transplant didn’t have any major issues with mosquitoes. Since the transplant and the immunosuppresion medication i take, I now have a huge problem with being bitten and also how much they itch. The itching becomes almost unbearable and as someone else commented I now get bitten in clusters of about 5 or 6 bites at a time. It would appear that mosquitoes are definitely attracted/deterred by different odors, otherwise repellents wouldn’t work. I know that since the transplant I have had some hormonal changes so I’m guessing their attraction to some and not others could be to do with hormone’s and their affect on our bodies

    Dianne, December 3, 2008 at 4:06 am
  26. my experience is different then anyone else!!!
    infrared radiation of body is more likely. I don’t know if you noticed but they bite rite on the veins. closer the surface. sounds more logical as well. other reason they fly closer to ear lopes at night. one more observation is they use ear drum as speaker and radar they bounce their wing noise find their way like bats.

    anyone to test these?
    let me know. email haluk@bosspacific.com.au

    haluk yildirim, December 9, 2008 at 5:07 pm
  27. I have a+ blood so does my son. I never get bitten, my son gets covered from head to toe in bites and where there are no bites there are scars from last years bites, he is constantly uncomfortable and itchy. I completely disagree with the blood type theory. I agree with the explanation that we are all bitten, but only some of us react negatively. I beleive those that are already predispositioned to things like asthma eczma and allergies are more prone to have an overeactive immune system that may cause these small bites to become irritated.

    serina cole, February 4, 2009 at 12:57 am
  28. Over the last two nights my partner and I have been unidated with the pesty Mozzies, my partner who is A blood type has been bited 13 times in the last two nights and I being O+ have no had not one single bite. So that blows the theory about blood group O is bited often than other’s?

    Melissa, February 10, 2009 at 10:38 pm
  29. So, what are scientists waiting for to find out
    what the mysterious secreted scent is that attracts
    these nuisance bugs?
    This isn’t rocket science!

    JD, February 16, 2009 at 6:52 am
  30. I think this is all very interesting – because my personal experiences are the opposite to the article. I am 30 and British and now live in South China where mosquitos are rife. I am O- blood type, I drink alcohol, and eat cheese…but I never get bitten (touch wood). My poor Chinese girlfriend on the other hand is A+, doesn’t drink alcohol or eat cheese but gets bitten all the time – to the point she is left with swellings and bruises. More research is required here I think. And yes, you would think this would be straight forward enough for scientists…

    JEP, March 22, 2009 at 1:06 am
  31. oh by the way serena, my girlfriend has no other allergies or asthma etc but still gets bad seriously bad reactions to the bites…

    JEP, March 22, 2009 at 1:10 am
  32. Mmmm…. I don’t think it has anything to do with blood type. I am Asian with AB+ blood type and I get eaten alive!! If I am with a group of 10 people, the mosquitoes will still find me! More research is needed. I usually don’t go out after dawn….

    Pinkie, April 16, 2009 at 8:57 pm
  33. Since I started to take Simvastin tablets 2 years ago to reduce cholestrol I notice that in the aerly part of the year March-may I get bitten regularly and generally have about 3 to 5 bites on the go at any one time.
    before I took these tables I rarely got bitten and generally once the damp season is over by June I am okay.
    I really don’t know what to do to stop them,even when I tuck my socks into my trousers if I go out into the garden they seem to get up my trousers.

    Malc, April 17, 2009 at 11:53 am
  34. I was biten all over yesterday.
    The strange is, when I was in Asia, I was never bitten and now I’m back in Europe, the second day I had like 150 bites.

    Sander, April 19, 2009 at 2:25 pm
  35. why is it mosquitoes more attracted to type O blood group people? any scientific evidence please?

    ammy, April 27, 2009 at 3:56 am
  36. Hi I am a 57yr old woman and as for as long as I can remember I have been been bitten by mosq. I am sitting here with numerous bites and I wasn’t outside!! We have a whole house fan and opened the windows(screens) and I got bitten!! I am type 0+ and I also have ITP.
    My husband never gets bitten…I found out I am also allergic to mosq. so the itch is unbearable!! I am frustrated to say the least.

    Linda, May 2, 2009 at 10:14 am
  37. I agree with the temperature idea in this article. I have such a low body temperature I hate air conditioners. I can’t remember the last time I was bitten, though people around me seem to be magnets for mosquitoes.

    Ramone, May 9, 2009 at 4:27 pm
  38. Didn’t really care til I went to the beach with my girlfriend and wanted to sleep under the stars with a comfortor and pillows in the bed of my truck. No bug spray was used because we didn’t think of it.

    I got destroyed by mosquitos! I probably got bit 50-75 times and my girlfriend got bit maybe twice. While I was wrapped up like a mummy sweating, she was next to me with her leg out of the covers to cool off. She thought I was crazy til she saw the welps the next day.

    we’re both A+

    Daniel, May 18, 2009 at 10:56 am
  39. omg I am A+ and I get eaten alive. I just walked out the door just now and got bit six times within less than 10mins. My husband has O+ and he never get’s bit. My legs and arms look like I was stung by a bee instead of a musquito. I hate them so much.

    Charlene, May 22, 2009 at 7:10 pm
  40. I’m a professional statistician and I feel a need to clear some things up.

    There is a probably a correlation between having type O blood type and getting more mosquito bytes, but as I’m sure you’ve all heard, correlation does not equal causation. This is an example of confounding with odorant markers, which are associated with both the outcome (more bites) and the predictor (blood type) and differentially distributed between the levels of predictor. Though having type O blood may not in and of itself be reason for a mosquito to choose one person over another, type O blood *is* more often observed in the “secretors” that mosquitos prefer.

    I’d hypothesize that in an experiment where odorant levels are controlled, the relationship between blood type and bite predisposition would vanish. However, you can say that on a population-wide level, knowing a person has type O blood makes them more likely to be a mosquito magnet, inasmuch as it makes them more likely to have the genes for giving off a mosquito-friendly scent.

    topher, May 25, 2009 at 12:44 pm
  41. I am type O+ and was only outside for an hour today and got bitten 13 times. Mosquitoes just love me and it is annoying. Every year I get so many scars from these nasty blood suckers because I itch them so bad. I think it is because my blood type. Everyone I know only get bitten every once and a while and none of them have type O blood like me.

    Lindy, May 26, 2009 at 12:15 am
  42. Since becoming a raw food vegan mosquitoes don’t touch me like they did in the past, has there been any studies on the correlation between mosquito biting & blood purity or cleanliness??

    ChrisT, May 29, 2009 at 10:07 pm
  43. ugh,as im reading this both of my feet are swelling b/c i got bit on the toes and around the house too!… does that mean im allergic???

    Rosan, June 1, 2009 at 12:29 am
  44. the last few weekends we’ve had outdoor dinners w friends. I’ve been bitten over a dozen times each night. The three others are usually not bitten at all, or may have one or two. Blood type or something else… this has been happening to me for years.

    michael, June 2, 2009 at 7:31 pm
  45. Hi, I get bitten all the time and very badly. Abroad or at home. The only repellent that I have found good is avon skin so fresh – woodland fresh. I have used it in USA, UAE and all over the world. So long as I am wearing it head to toe I am ok!! With out it I have been admitted to hospital as I react very badly!!! I only hope it continues to work for me!!

    Heather Lavery, June 7, 2009 at 8:01 am
  46. I think that a mosquitoes only bite you when you are in the shade, if you are in the sun they can not see you beacuse you blend in with the heated suroundings.
    I think they see heat, like in the movie preditor, he did not see Arnold as a human but as heat while in a shaded forrest but as soon as Arnold covered himself with the cool wet mud then the preditor could no longer see him.
    I don’t know for sure but this is my think on how they pick you out and heat among a cool back drop says food to them.

    Jo-el, June 10, 2009 at 3:48 pm
  47. Well, anyone notice that the insect used for the picture on this article is actually a Mayfly? I get bit a lot! can’t a gene specialist create a strain of Mosquitos that all of the sudden mutate and have no wings after several generations? Seems like beter use of gene studies, ridding the planet of Mosquitos would solve a lot of infectious diseases.

    Forrest, June 11, 2009 at 1:36 pm
  48. I went to Southern Maryland last summer and I got bitten so bad. I had about 20 bites on each leg and a whole lot of random ones all over my body. I just came back from Cape May, NJ and I am bit up again. Not quite as bad but I have about 7 or so on my legs and ankles, some around my neck and ears and some other random ones. I am not sure of my blood type but I wish I knew why these things bite the hell out of me. My boyfriend was with me at both places, doesn’t even put bug spray on and only gets like 1 or 2 bites total. Here I am scratching like crazy. I don’t understand and I am honestly quite sick of these damn bugs biting me so much. I wish I knew what the reason was. I don’t wear perfume when I’m outside in the spring or summer cuz that makes it worse. I was told to swallow a matchhead before going outdoors in areas I might get bitten.

    Stephanie, June 13, 2009 at 2:51 am
  49. My husband and I can be sleeping on the same bed or be in the same vecinity as a mosquito and they never bite him: They feast on me! I jokingly tell him its my sweet blood they’re after. I have O+ blood, I’m not sure what my husband has.

    Mary, June 15, 2009 at 2:09 pm
  50. All this thing about blood group and CO2 etc is bull crap . Just read the comments and you can tell – these are not common factors among the people who get bitten.
    If you have been doing bad things, God sends mosquitos to leech you. Thats right – its a punishment plain and simple.
    If not , you are spared – how difficult is that to understand ?
    Long story short – do good deeds that will please God, and he will in time direct the mosquitoes to the bad guys.

    Mosq Guru, June 26, 2009 at 3:02 pm
  51. I am a white make 53 years old, my sister is 1 year younger, since we were small children we have not been bothered by mosquitos, my father was also not bothered by them durnig his life. One intersting note is that all three of us have/had blood type O negetive, while my mother who had A (I think) blood was constantly being eaten up by them, this isn’t just that they don’t bother me much, I mean that they don’t bite me at all, maybe twice in 3 or 4 years.

    William Pike, June 27, 2009 at 8:25 pm
  52. I really don’t get it…I am an 0- i will be the first person to get bit all the time but my brother in law is an A and he NEVER EVER gets bit..and when he does the 1 mosquito that bit him ends up just flying away after 1 sip! They just keep suckin away on me until I have a bit the size of a half doller coin of course. There really bad can anybody help me with any suggestions..I put on OFF sport for waterproof and sweat proof and that really doesn’t work eather….

    Jamie, June 29, 2009 at 7:59 am
  53. I’m a redhead with fair skin. I’m also a bit heavy. Mosquitos ALWAYS target me. As soon as it is dusk – I’m toast! Right now I have about 20 bites from working in the yard. It’s the most I have ever had and it’s sooo itchy!

    Mel, July 4, 2009 at 11:35 pm
  54. I am Blood type O+ and I seldom get bit. If I get 5 a summer that is a lot.

    Mary, July 5, 2009 at 11:21 pm
  55. im O- and never get bitten. they will land on me and then fly to the next person. i dont even own a can of mosquito spray. i wonder if it has more to do with what foods we eat and how our bodies digest it? you are what you eat right? mabe some blood is less desireable to them.

    sasha, July 6, 2009 at 10:50 pm
  56. I’m 30, pregnant and have type A+ blood. Ever since I was a little kid, I’ve been the only one who ever gets bothered by mosquitos and, even more horribly, no-see-ums. I was pregnant with my daughter in the summer of 2007 and counted over 60 no-see-um bites on my left leg alone–and I also have immune system problems…so these bites were ten times worse than the two my son had and the one my husband had. Ugh, I hate bugs and the itching and scratching and burning feeling they leave me with. I have scars ALL OVER my body from childhood and adulthood from scratching the bites until they bled and then scratching at those because they still itched. :((((( HELP!

    Dawn KILIC, July 7, 2009 at 11:26 am
  57. Im A+ blood i get bit so much right now i have 57 i counted the most ive had is 88 i use bug spray but it dosent work and this happens every year since i remember im only 15 so hopfully u can find a way 2 stop this

    Rory Scanlan, July 8, 2009 at 12:14 am
  58. quoting Sasha from July 6, >>I’m the same way they will land on me and kind of sniff around and then fly off, occasionaly one will try to bite and sort of gets stuck, I’ll reach down and wipe her away, never get any kind of bump or mark from it.

    William Pike, July 8, 2009 at 11:01 pm
  59. I am blood type A, I get eaten alive by mosquitos whereever I go. In the Caribbean I got pretty large watery blisters and intense itching. I will never go back there. I had on repellant, mosquito netting over the bed, tooks loads of the vitamin Thiamine, burned mosquito coils under the bed and on both nightstands and they still bit me. I just got back from Redding, CA and they aren’t nice ones up there either. I’m still itching a week after I was biten 9 times. I got watery blisters from those bites also but only half as bad as Antigua, St. Vincent and Bequia. Eash island seemed to get worse and it was actually making me sick. It wasn’t even mosquito season! I have found that if I can apply Witch Hazel on a cotton ball as soon as I am bitten that it helps a great deal.

    Sami, July 13, 2009 at 7:18 pm
  60. By the way, my boyfriend is an “O”. They hardly touched him and if they did he had only minor irritation that didn’t last more than an hour or two. He had no repellant on at any time to try to keep them from me but it did not work at all.

    Sami, July 13, 2009 at 7:23 pm
  61. I’m just rereading these things and other than the few crazies it seems that you are all saying that the Positive blood type(both O and A) people are being eaten, as opposed to the Negatives. Can that be the link?

    Sami, July 13, 2009 at 7:31 pm
  62. Such sad posts. I’m B+, get eaten alive and in clusters if I spend more than two minutes in my front yard. No one else is affected. Other family members = three O+. Years ago a landscaper told me to take garlic capsules. They work wonderfully. Just started taking them for this season and can’t wait for the effect to kick-in. Scratching now,

    G Clark, July 14, 2009 at 5:31 pm
  63. Too bad there is no easy explanation. I have O- blood, so that theory is fun to entertain, but for half my life I was not at all bothered by mosquitoes, now I am their favorite food source. I spent the day at Sunrise in Mt Rainier National park yesterday and was covered with bites that, again, swell and welt, my hands and toes were swollen. They bite regardless of what I put on or wear. The allergic reaction I get is a bit frightening, I actually got a cold shiver after one set of bites. I am worried about what is happening, on one camping trip I had so many bites that would not come out of the camper and took antihistamines to counter the hives and chills. This used to never happen, and I usually camp in a tent, and have for years. It is like thing flipped a switch in my and I have become bait. I was not drinking anything but water, my diet (good, healthy) has not changed. I am carrying a bit more weight than I did as a teen or a twenty-something, and after 2 pregnancies I have not the same weight as I once did. There was a difference after having 2 children in how many mosquito bites I got (lots more). But now, I am in the middle of the mosquito’s radar zone.

    Elizabeth, July 17, 2009 at 1:10 pm
  64. I am also A- and always get bitten more than any of my o Positive relatives, More study needs to be done!!!!!!!!!!

    deb, July 18, 2009 at 8:39 pm
  65. A positive and I almost NEVER get bitten.

    There must be something to this blood type stuff.

    Tailgunner, July 22, 2009 at 1:42 am
  66. I live in the Philipines with my brother. He is blood type O the same as me.
    We eat the same food and drink the same types of alcohol.
    I have never been bitten in my life but my brother is a target. I believe there is something in my blood which deters the mosquitos. I have watched one land on me and immediately take off probably heading towards my brother!!

    bob potter, July 22, 2009 at 6:32 am
  67. question for Elizabeeth, you said that the first half of your life you were never bitten, now you are their favorite food, at what age did this change, and were you pregnate? my sister’s imunity changed with her first pregnancy.

    William Pike, July 26, 2009 at 9:42 am
  68. I am blood type A+ and get bitten really bad, the only thing that somewhat helps me is Avons “skin-so-soft” and even that wears off after a while. Ny husband’s type is O- and he rarely gets a bite. These seem two be two ends of the spectrum that mosquitoes either attack or dont. I guess theres no set pattern

    Kat, July 26, 2009 at 11:57 pm
  69. Mosquitoes used to bother me tremendously. The bites produced the standard welts, and itched like crazy.

    After spending about 15 years as a Conservation Officer in Michigan’s Upper Peninsula – with LOTS of mosquito bites – I realized that I no longer got any bites. For the rest of my career, I was bite free.

    Even now, 12 years after retirement, I have an immunity. They still buzz around me. On occasion, I will feel a very slight stinging sensation, as one starts to bite me. They never complete their meal, but fly off after just starting to bite.

    Palod, August 2, 2009 at 7:14 am
  70. I bet people who get laid more get bit less. Mosquitoes can feel that tension

    ZorkDude, August 10, 2009 at 9:19 pm
  71. Hot blooded O+ type scratching the heck out of myself at the moment, looking for a dang cure. Can I deposit my blood at a blood bank and ask for a different currency? I don’t care if the exchange rate kills me, this is insane! I don

    Ben, August 13, 2009 at 6:39 pm
  72. if you have the o blood type the only reason wny they come after you is becuse thay cant resist is because it tastes so good to them.

    Alexander, August 14, 2009 at 10:26 pm
  73. this kind of explains a lot. im leaning more towards the chaos theory though. i believe randomness is essential to order.

    charles patrick, August 21, 2009 at 9:20 am
  74. I just wondered is it because o type blood can be given to most blood types and is a common to all. I am O possitive and I am alway bitten and even by the irish flys from end of augst, Help needed.

    Ethel, August 22, 2009 at 12:19 pm
  75. my whole family is type o blood, but for some reason i always get bitten the most and have a minimum of 30 bug bites on me at all times during the summer. they usually center around my ankles and feet, i guess i just happened to be the one who got the most delicious combination of genes in the family…

    constance, August 25, 2009 at 12:44 pm
  76. I have always thought something to do with blood. I am A-, so was my Dad; rest of family +. He and I always bitten, others not. My theory has been that is to with the negative bit rather than whether A, AB, O etc. Not only do I always get bitten, but I am allergic to the bites and always get infection, cellulitis, allergic reaction bordering on anaphalaxis – last time ended up on a drip for 24 hours!

    Marion Hughes, August 26, 2009 at 5:54 am
  77. I’m blood type A and get absolutely chewed on; my wife is an O and the little buggers don’t even seem to know she’s around.
    I was under the impression the heat signature you put out affects how mosquito’s “see” you.
    She’s ALWAYS cold, but I put out a tonne of BTU’s.
    The house could be on fire and she’d be putting on a sweater – I’m happy in a -30 blizzard.
    But then there’s no mosquito’s around then.

    Ed, September 1, 2009 at 3:10 pm
  78. My husband is type O and the mosquitos don’t pay any attention to him. They go straight for me, type A. Could it be the secretor? I should get that checked.

    Kathy, September 1, 2009 at 6:45 pm
  79. I am blood type O and get bitten like crazy. I just had to speak with someone out in the yard, I was immediately attacked by mosquitoes and ended up cutting our conversation short because of the mosquitoes. The man I was talking with did not get bitten. Now have about 30 bites all over from just 15 minutes outside! I put on repellent in the morning but don’t always remember to reapply it until after I am attacked. I was once told that taking B vitamins would stop them from biting you, but I tried it, and actually I still take B vitamins and still get bitten like crazy. I am interested in the garlic capsules. I already take one garlic capsule a day, if I took more I wonder if it would help? Also would it have to be non-de-odorized garlic?

    Jules, September 2, 2009 at 7:39 pm
  80. i kno how yall feel. i have nooo idea what blood type i am but all i kno is that everyday, i HAVE to get bitten by a freakin mosquito. my problem is i walk a lot but, just when i get to my house, i get bit.i wear shorts that go to my knees so how do the dang pests get up to my thighs? heres my solution,not much help but it works……..ish: get skin cream and rub it on you after you get bit, it should help a littli and try to control your itching, the more you itch the more the bite gets bigger and itchier. the only thing we can hope for is that in a few million years, the world will end and mosquitos will be gone (just be sure you have an spf of 1000000 for sunscreen,your gonna need it)

    Elana, September 10, 2009 at 9:46 pm
  81. I am A+ and get bitten all of the time. I get quarter to half dollar sized whelps with each one. I have found that putting ice on the bite helps. It reduces the swelling and thus the itching. If you can keep from breaking the skin on the bite it will heal much faster.

    Peggy, September 24, 2009 at 12:32 pm
  82. AH! I have type O blood and I will be the ONLY person in a group that gets bitten! Everyone thinks I’m whiny because they don’t seem to be getting bites. Mosquitos and fleas have ruined the appearance of my legs forever. I hate the smell of deet. I wish there was another way! Thanks for the info.

    Becky, September 24, 2009 at 7:28 pm
  83. If mosquitos are attracted to CO2 or people who exhale more CO2, and if “thinking” cause the brain to use up more 02 and give out more CO2, then “thinking” may be the key to mosquito bites?

    yubing, October 10, 2009 at 7:08 pm
  84. this is alot lol (:

    jennifer, October 23, 2009 at 5:43 pm
  85. im heela bored ):

    jennifer, October 23, 2009 at 5:44 pm
  86. I never get bit, but i always have a good laugh at everyone else that does. I can be camping, at a bbq, ballgame, it doesn’t matter, I just don’t get bit. My wife gets eaten alive, even when she uses repellent. I don’t use repellent, cuz I DON’T GET BIT. For all you bite sufferers, let me just tell you how nice it is to never have to worry about mosquitos. sorry, but I just love to rub it in.

    trade, October 24, 2009 at 11:44 pm
  87. Ugh seriously, I am type O and every time I step outside my arms get all their blood sucked out! I don’t know anyone who gets worse bites than me. It’s funny though because I’m so good at ignoring it that it doesn’t even bother me, and if it does get the occasional agitation, it feels good scratching them!!

    D.Jay, October 27, 2009 at 10:34 am
  88. The funniest part of the whole article is the photo. The pictured insect is not a mosquito (Culicidae) but a crane fly (Tipulidae), and these do not bite at all.

    Hopper, November 1, 2009 at 11:01 am
  89. I am an O Blood type, I drink beer and never try to kill them…so Im pretty well the prime candidate. I sat outside one night after work with a beer in 20 minute I got 26 bites on my back, the other two outside didnt get bitten at all.

    Cheri, November 16, 2009 at 8:02 am
  90. I’m AB-, usually have a 97.2 body temperature. My 8 siblings have the same blood and temp. None of us ever got bitten by mosquitos, despite living in mosquito laden Michigan woodland area. Our parents are bitten at a normal rate. ALL of the 24 grandchildren of various blood types are bitten at a high rate, several requiring medical care after campouts, etc.

    Until I went to nutritionist and my diet changed from almost exclusively meat, milk, and junk food to one containing whole grains, fruits, and vegetables. Since my diet change in 2006 I have been bitten several times each year, and this summer (2009) I was bitten 7 times, and the sites got itchy and red. That never happened before.

    Hormones? Age? Inheretted immunity, then acquired intolerance?

    I blame the vegetables.

    Sue, November 22, 2009 at 1:42 pm
  91. I’m 13. I’m type AB and I had gotten bitten all over my arms and legs when i was smaller so much, that i went to the doctor once{around 10 or 11 years old} . it was itching horribly. my mother even went as far as repeatedly changing my bed sheets because this happened over night. She bought a spray and sprayed me with it. It was to repel against the mosquito. I still experience getting bitten a lot. It’s quite annoying.

    alexia, November 29, 2009 at 3:20 am
  92. I never get just one bite. Usually more that 5-7 and then they come back for more and bite up to 11 times. these are the “normal” times i get bitten. Like I stated above, I went as far as seeing a doctor because my arms and legs we full of bites. If I showed someone, they would freak out. I’m honestly fed up. I’m writing this now because I’m experiencing the itching on my legs and hands as I type this.

    alexia, November 29, 2009 at 3:26 am
  93. The picture given is not that of a mosquito! It’s a crane fly (Tipulidae)

    P K Sumodan, December 14, 2009 at 10:50 am
  94. I am a researcher working in an unrelated area; however,the above discussion seemed very interesting to me. I am just wondering if anyone has looked at the concentration of the specific protein types in the blood that mosquitoes are looking for and the number of bites. Thanks for the article and everyone’s comments.

    Chowdhary, January 8, 2010 at 6:17 pm
  95. thank you for a wonderful article. now my colleague and I are aware about mosquito bite in general

    prito, January 27, 2010 at 3:42 am
  96. thank you for a wonderful article. now my colleague and I are aware about mosquito bite in general. that what an awesome information that could help my topic.

    prito, January 27, 2010 at 3:43 am
  97. Interesting post, I’m an ‘O’ and I rarely ever get bit. Never thought about it much before though.

    mosquito traps, January 27, 2010 at 9:57 pm
  98. for years and years every time i go camping im the ONLY one who gets eaten by thos damn bugs .When i was 10 are atv got stuck 10k away from help and we had to walk all the way there . my back was covered in bits and the sad part is they had to bite thru jacket

    Eaten alive, January 31, 2010 at 10:38 pm
  99. I’m B+ 56-year-old female and hardly ever get bitten, although I used to when I was younger. I live in climate where mosquitoes are prevalent except in winter.

    DebH, February 5, 2010 at 4:52 pm
  100. There seems to be very little pattern with blood type on the above posts….many of you do not note whether you are rhesus negative or not? Maybe this makes some difference too? I also think it is dependant on the type of mosquito…has to be! I rarely get bitten in Europe but on a recent trip to Egypt I got eaten alive – over 100 bites over two evenings (in clusters) and my four friends had around ten bites between them all!!! I am B- blood type. Wish they could eliminate the world of these little pests!

    LynseyC, February 26, 2010 at 7:35 am
  101. Just another random thought about body temp…… apparently the colder we are in body temp the less we get bitten….the colder I am the more I wear…hence less skin exposed to these nasty little blood suckers…hence less bites? No? People who have raised body temps would be inclined to wear less. Not a scientific fact… more like common sense :)

    LynseyC, February 26, 2010 at 7:41 am
  102. I am O- and mosquitos could not be less interested in me. I am grateful to not have to wear bug spray all the time. I do know I have very good oxygen uptake. This may help. It would be nice to know why I’m so lucky, maybe diet or vitamins? I keep up on my vitamin Bs…. I have been to the Yucatan, Bahamas, Virginia and the Mid-west in the summer, and all up and down the West Coast. It is so rare that I get bit in any of these places. I did get bit as a child though.

    Chelsea, March 1, 2010 at 11:05 am
  103. I thought as Marion post 76 that it may be to do with the Rh factor rather that the blood type. I am A- and never get bitten. She is A- and attracts mosquitos, so that theory is out the window.

    Noelene, March 13, 2010 at 6:36 am
  104. It seems blood type and Rh doesn’t matter.

    There is a wide range of reactions such as multiple bites, cluster bites (that would be me); very large welts indicative of a stronger reaction to the mosquito “saliva” (me again) vs. those who get garden variety itchy bites; and those who even are bitten through clothing (me again).

    I live in Maryland about a mile from the bay and have already fed more than a few mosquitos on just one 30-minute power walk at 6 pm yesterday (so movement doesn’t deter them from biting) after an unusually cold winter and snowy/wet couple of months with lots of snow melt and standing water.

    Garlic may interfere with the host scent as some have expressed.

    And some of us experience something midlife that changes are bite frequency too.

    Replentents work, and sometimes not. hmmmmm…. I wonder if it might be the strain or species of mosquito that is the key. Could it be that some strains of mosquitoes indigenous to an area go after some people, but not others? And that repellents are ineffective against some strains, but not others?

    Aveeno baths, hydrocortison creams, ice packs, and benadryl make up my drug store list from March through late October for me every year….

    kefirah, March 17, 2010 at 4:44 pm
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