For decades, people have blamed this on “sweet blood” or diet, but entomologists and researchers have identified the specific biological and chemical markers that drive mosquito preference. Understanding these factors provides valuable insight into vector behavior and helps explain why some individuals experience disproportionate discomfort during mosquito season.
Female mosquitoes require the protein found in human blood to develop their eggs. To find a host, they rely on a highly evolved sensory system that detects chemical and visual cues from impressive distances.
Here are the primary reasons mosquitoes are more attracted to some people than others:
Carbon dioxide is the primary long-range attractant for mosquitoes; they can detect CO2 plumes from up to 50 meters away. Whenever we exhale, we release a chemical trail. Because mosquitoes follow these trails to their source, individuals who exhale more CO2 are naturally targeted more frequently. This typically includes:
Once a mosquito gets closer to a human host, they switch from tracking CO2 to analyzing body odor. Your skin is covered in a unique ecosystem of microscopic bacteria (your skin microbiota) that metabolizes sweat into volatile organic compounds.
Mosquitoes are highly attracted to the byproducts of this process, particularly lactic acid, ammonia, uric acid, and specific carboxylic acids. Interestingly, research indicates that having a lower diversity of bacteria on your skin actually makes you more attractive to mosquitoes, whereas a highly diverse skin microbiome acts as a natural deterrent.
While old wives’ tales suggest that eating garlic or taking Vitamin B will repel mosquitoes, these claims have been widely disproven by modern science. However, certain lifestyle choices do increase your risk:
Abiotic environmental factors specifically heat and humidity play a massive role in mosquito activity. In Marietta, Georgia, the local climate creates a perfect incubator for mosquito populations, which directly impacts the community.
Marietta experiences hot, humid summers and generally mild winters. Because mosquitoes thrive in environments with ample standing water and sustained temperatures above 50°F, Marietta’s mosquito season is exceptionally long, typically running from March through November.
For the local population, this means that individuals who are genetically predisposed to being “mosquito magnets” face an extended window of exposure. High summer humidity also limits how quickly human sweat evaporates, keeping skin damp with the lactic acid and ammonia that mosquitoes seek out.
