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What evolutionary or other benefit does the mosquito get from causing pain?

In evolutionary terms, I can understand how the first mosquito, due to a genetic blip, able to inject some anaesthetic would be able to suck more blood and therefore live/breed longer. As those of us who holiday abroad know to our cost, most mosquitoes also inject some poison or irritant. However, this takes effect long after the mosquito has fed and left and I cannot see what’s in it in evolutionary terms (or any other terms) for the mosquito. Any enlightenment would be welcome.
Ron Binnie from Warwickshire (Age: 55+)

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