Understanding how mosquitoes smell humans could save thousands of human lives – CNN

(CNN)Of the more than 3,000 species of mosquitoes in the world, just a small number have evolved to specialize in sucking human blood.
How human-biting mosquitoes track us down so effectively isn’t currently known, but it matters, since they don’t just make us itch. They also carry dangerous diseases such as Zika, dengue, West Nile virus and malaria that can be deadly.
In fact, stopping these pesky insects in their tracks could save up to half a million lives lost to those diseases each year….

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