Scientists decode why mosquitoes prefer certain people

ISLAMABAD: (Web Desk) – Scientists are making new progress in understanding why mosquitoes seem to prefer biting certain people over others, uncovering a complex mix of chemical, physical, and behavioural factors behind their choices.

Experts say it is not a myth that mosquitoes show preference, but they also stress that humans are not constant “mosquito magnets.” According to researchers, female mosquitoes—responsible for biting—use highly sensitive receptors to detect carbon dioxide, body odour, heat, and humidity when selecting a target.

Studies show that carbon dioxide exhaled by humans is the first major signal mosquitoes detect from a distance. As they get closer, body scent and temperature play a stronger role in attracting them.

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Researchers also found that around 300 to 1,000 different odorous compounds are released by the human body, and only some of these influence mosquito behaviour. A recent study identified 27 key compounds linked to attraction, with variations in skin chemistry and microbiota making some individuals more appealing than others.

Popular beliefs such as blood type or physical appearance influencing mosquito preference have been dismissed by scientists, who say there is no solid evidence supporting these claims.

In controlled experiments, researchers observed that even small changes in a compound called 1-octen-3-ol can significantly increase mosquito attraction, highlighting how sensitive their detection system is.

Alcohol consumption has also been linked to higher mosquito attraction. Studies show that drinking beer can raise body temperature, increase carbon dioxide output, and alter skin odour, making individuals more noticeable to mosquitoes. In one study, participants who had consumed beer were significantly more attractive to malaria-carrying mosquitoes compared to when they drank water.

With climate change expanding mosquito habitats, scientists warn that diseases like dengue, yellow fever, and chikungunya could spread more widely in the future. Experts recommend preventive measures such as wearing protective clothing, using repellents, and limiting alcohol intake to reduce mosquito bites.