Why Mosquitoes Bite Some People More Often

Paris – 19.07.2026: The question of why mosquitoes appear to bite certain people particularly frequently cannot be explained by a single characteristic. A recent overview by franceinfo addresses the topic in the middle of mosquito season. Health authorities point out that female mosquitoes perceive and assess several signals simultaneously when searching for a blood meal.

Carbon dioxide, which people release when breathing out, plays an important role. Mosquitoes can detect this gas with their sensory organs and use it to locate potential hosts. At closer range, other stimuli become decisive: body heat, movement and, above all, the mixture of volatile substances emitted by the skin and breath.

This personal scent signature is created in part by sweat, skin oils and the microorganisms on the skin. It differs from person to person. The French health authority Anses therefore emphasizes that while there may be a genetic predisposition, a person’s current physical condition has a particularly strong influence on how attractive they are to mosquitoes.

When body temperature rises, the production of bacteria and scent compounds on the skin also changes. This can occur during fever, after alcohol consumption or during pregnancy, for example. The insects also respond to certain visual stimuli: according to Anses, dark colors are more readily detected than light clothing. There is therefore no universally applicable “mosquito skin”.

The intensity of the reaction after a bite should also not be confused with the number of bites. While feeding, the female mosquito releases saliva into the skin. The substances it contains facilitate blood intake but trigger local inflammatory reactions of varying intensity. Redness, itching and swelling may therefore be significantly more noticeable in some people than in others.

Effective protection does not come from simple home remedies, but primarily from avoiding bites. Anses recommends eliminating standing water around homes, as it provides breeding grounds. Long, light-colored clothing, intact window screens and approved repellents can also reduce exposure. Prevention is particularly important for mosquito species that can also transmit pathogens.

Anyone who develops severe swelling, breathing difficulties, circulatory problems or fever after a bite should seek medical advice. As a rule, mosquito bites remain unpleasant but harmless. However, according to current research, it is plausible that one person may be bitten much more frequently than others during an evening: what matters is the interplay of individual signals, not the condition of the skin alone.