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There are plenty of reasons to hate mosquitoes. They are annoying, hard to catch, and their bites can itch for days. But they’re not just irritating – in many places they spread diseases such as malaria, Zika and dengue.

It’s really annoying to get bitten by a mosquito. Your skin often swells, and the bite can itch for days. But in many places in the world, that small bite isn’t just annoying. It can cause a life-threatening disease: malaria.