Mosquitoes transmit disease to approximately 100 million people each year, and their bites have shaped human history. There are approximately 3,500 species of mosquitoes throughout the world.
The vast majority are generalists who bite any vertebrate they find in their path.
Human diseases transmitted by mosquitoes are caused by just half a dozen species of three genera ( Aedes, Anopheles and Culex ), which have evolved to specifically target us thanks to the carbon dioxide we emit and our body effluvia.
Why have some mosquitoes specialized in biting humans?
Most researchers think that specializing in people would have been of no particular benefit to mosquitoes prior to the development of sedentary cultures about 10,000 years ago.
Once settled, human populations could have provided an easy, safe and always available resource , unlike other groups of migratory animals that only guarantee blood seasonally.