One could quibble, and point out that it’s the malaria parasite that does the dirty work, more than the mosquito; but it’s only a quibble.
Short film from Bill Gates explaining why he helps wage war on the lowly mosquito. Use of science to find ways to defeat mosquito-borne disease transmission is especially important in the post-DDT world, since DDT resistance now aids every mosquito on Earth.
There are about a dozen different diseases that are spread to humans by mosquito bites including dengue, yellow fever, Zika, chikungunya, and malaria. This little mosquito actually kills more humans than any other thing.
Learn more at: http://b-gat.es/2cUd9Ff