Experts link higher mosquito bites to body chemistry, carbon dioxide emission and alcohol intake; urge use of nets and repellents

Researchers in Lagos have explained the scientific reasons why some Nigerians are bitten by mosquitoes more frequently than others, highlighting the role of body chemistry, carbon dioxide output and lifestyle choices. The findings were released on Tuesday following a series of laboratory studies conducted in collaboration with international partners.

According to the scientists, mosquitoes are not randomly attracted to people. The lead researcher explained that female mosquitoes are drawn first to carbon dioxide exhaled by humans, which they can sense from several metres away. As they approach, they rely on body odour and skin heat to select specific targets. “Our studies show that individuals who produce more sebum—a natural oil on the skin—emit compounds that are especially attractive to mosquitoes,” the scientist said during a briefing in Ikeja.

The research further dispelled popular beliefs about blood type or skin colour influencing mosquito preference. The team stated that there is no scientific evidence supporting claims that blood group affects mosquito attraction, noting previous studies were too small for meaningful conclusions. However, they found that pregnant women in their second trimester face a higher risk due to increased body temperature and metabolic changes.

Alcohol consumption was also identified as a factor that increases mosquito bites. In one study involving 465 volunteers, those who consumed beer within the previous day were over 30 percent more likely to be bitten. Experts attributed this to higher body heat and altered skin odour after drinking alcohol.

The researchers advised Nigerians to use loose-fitting clothing that covers the skin, apply insect repellent, and sleep under treated mosquito nets—especially during rainy season when malaria risk is highest. They also recommended minimising alcohol intake before outdoor activities in mosquito-prone areas. “Prevention remains key because most risk factors are tied to natural body processes,” the scientist added.

Public health officials say these findings reinforce ongoing malaria prevention campaigns across Nigeria’s six geopolitical zones, urging residents to prioritise protective measures regardless of perceived personal immunity.

Source: https://www.pulse.ng/story/why-mosquitoes-bite-some-people-more-than-others-2026061717360585875