The mosquito's saliva acts as a lubricant and an anesthetic. It's also the saliva, not the bite itself, that causes an allergic reaction or the itchy bump. The female mosquito feeds off the blood of warm-blooded animals, including humans. When she bites, she injects some of her salivary fluid into the wound, causing swelling and irritation. Many mosquitoes inject infectious microorganisms and can transmit diseases such as encephalitis, malaria, and yellow fever.


on to the next question