I think it's a combination. It seems like mosquito whines are in a particularly irritating frequency range and any time you have a mosquito right next to you, you get paranoid about bites.
Apparently the whining of mosquitoes reaches a frequency of up to 1200 hertz when they are courting each other. Normally a female's wing-beat produces a frequency of 400 hertz, and a male's frequency is 600 hertz. While courting, this whining increases significantly and the combined frequency is a staggering 1200 hertz.
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