World Dengue Day: Why Mosquitoes Bite Some People More Than Others

Have you ever noticed that mosquitoes seem to target certain people while leaving others relatively untouched? If it feels like you're always the one swatting away bites while your friends remain unbothered, it may not be your imagination. On World Dengue Day, experts say there is real science behind why some people are mosquito magnets - and understanding it could help reduce the risk of dengue and other mosquito-borne diseases. Dengue, a viral infection spread primarily by Aedes aegypti mosquitoes, remains a major public health concern in many tropical countries, including India. While anyone can be bitten, research suggests that mosquitoes are naturally more attracted to some individuals than others.Also read: ‘Patients Are Frantically Searching’:

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Your body odour plays a major role

Mosquitoes use their highly sensitive sense of smell to locate potential hosts. Human skin naturally releases hundreds of chemical compounds through sweat and body oils, creating a unique scent profile. Studies have found that people who produce higher levels of compounds such as lactic acid, ammonia, and certain carboxylic acids tend to attract more mosquitoes. These chemicals act as signals that help mosquitoes identify suitable targets. Interestingly, the bacteria that naturally live on the skin also influence body odour. Different bacterial communities can make some people significantly more attractive to mosquitoes.

Carbon dioxide makes it easier to find you

Mosquitoes can detect carbon dioxide (CO₂) from surprisingly long distances. Every time you exhale, you release CO₂, helping mosquitoes locate you. People who produce more carbon dioxide tend to attract more mosquitoes. This includes adults, larger individuals, and those with higher metabolic rates. Physical activity can also temporarily increase CO₂ production, making you more noticeable to mosquitoes.

Body heat and sweat attract mosquitoes

Mosquitoes are drawn to warmth and moisture. After locating a person through scent and carbon dioxide, they use body heat to identify the best place to land and feed. People who exercise frequently, spend time outdoors, or naturally sweat more may find themselves attracting more mosquito attention. Warm skin and perspiration create ideal conditions for mosquitoes searching for a blood meal.

Does blood type matter?

Some studies suggest mosquitoes may show a preference for certain blood groups. Research has indicated that people with blood group O may be bitten more frequently than those with blood group A, although scientists say additional research is needed to fully understand this relationship. It is important to note that blood type is just one factor among many and does not determine mosquito attraction on its own. Pregnant women are often more attractive to mosquitoes because they tend to exhale greater amounts of carbon dioxide and have slightly higher body temperatures. This may increase their likelihood of being bitten, raising concerns in regions where dengue is common.

How to reduce your risk of dengue

While you cannot change your genetics or blood type, you can reduce mosquito exposure by:

• Using mosquito repellents regularly
• Wearing long-sleeved clothing
• Eliminating stagnant water around homes
• Using window screens and mosquito nets
• Avoiding outdoor exposure during peak mosquito activity periods

The reason mosquitoes bite some people more than others comes down to a combination of body odour, carbon dioxide production, body heat, skin bacteria, and other biological factors.