system
Given the following post, respond as if you're commenting on Reddit:
human
What causes mosquitos to be super attracted to some people, and completely ignore others?

Mosquitos attack me with a vengeance, but they won't touch my sister.

I am 25.  My sister is 23.  If we both go outdoors and play a sport for 2 hours and wait until dark, mosquitos still do not touch her.  It doesn't matter what I've done, mosquitos are on me like hummingbirds to nectar.  I can even wear bug repellant, doesn't help much.

I've heard similar stories from friends and acquaintances.
gpt
There are various physiological factors that determine your likelihood of getting bitten.


* Blood type: Several studies have found that individuals with blood type O are at a greater risk, much more so than individuals with type A, B, or AB^1,2.


* Higher production of carbon dioxide will also attract a higher number of mosquitoes. In fact, traps are often equipped with CO2 tanks to be more effective^3,5.


* Production of certain acids on the skin such as lactic acid will contribute to one's attractiveness^4


**Citations**


1) Wood, Corrine Shear, and Dore, Caroline. 1972. “Selective Feeding of Anopheles gambiae according to ABO Blood Group Status.” Nature 239: 165.

2) Yoshikazu Shiraia, et al. 2004. "Landing Preference of Aedes albopictus (Diptera: Culicidae) on Human Skin Among ABO Blood Groups, Secretors or Nonsecretors, and ABH Antigens." Journal of Medical Entomology 41(4):796-799.

3) Dekker , T. and Takken, W. 1998. "Differential responses of mosquito sibling species Anopheles arabiensis and An. quadriannulatusto carbon dioxide, a man or a calf." Medical and Veterinary Entomology, 12: 136–140

4) Steib, Birgit M., Geier, Martin, and Boeckh, Jurgen. 2001. "The Effect of Lactic Acid on Odour-Related Host Preference of Yellow Fever Mosquitoes" Chemical Senses 26: 523-538.

5) Geier, Martin, et al. "Odour-guided Host Finding of Mosquitoes: Identification of New Attractants on Human Skin." 4th International Conference on Urban pests. (Oral Presentation).