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This is rule of nature that mosquitoes feed on human blood. They need to suck human blood for survival. There are many species of mosquitoes, which thrive on plant juices. There is no scientific evidence behind the factors like body odour, sweat, black colour clothing etc attracting the mosquitoes.
The scientific reason behind the fact that some people are able to feel the irritation of mosquito bites while others don't is: when a mosquito bites a human being certain protein like substances called antigens are introduced in our bodies. Many people have antibodies against these antigens in their bodies, which can counteract these antigens. Thus these people do not feel the effect of mosquito bite. People who don't have anti-bodies in their blood cannot counteract the affect of these antigens. As a result there is a mild inflammatory reaction producing swelling redness and itching. Such people feel the irritation caused by mosquito bite.

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