I spend most of my time in the western US, and the mosquitos there never bother me, but they do go after my wife and one of my two sons. Aside from being ravaged by a swarm of mosquitos in a Florida phone booth 40 years ago, I never had a problem. That is, until earlier this year when I spent two months in Hawaii. The mosquitos there were relentless and I always had itching bites no matter what brand of repellent, or how much I used.
This article mentions an observed preference to certain people by mosquitos, but it doesn't go into why. It seems to leave out geographical considerations, which I know from experience, are real.
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