why doesn't a mosquito help in spreading aids ?

Answer 1

The results of experiments and observations of insect biting behavior indicate that when an insect bites a person, it does not inject its own or a previously bitten person's or animal's blood into the next person bitten. Rather, it injects saliva, which acts as a lubricant so the insect can feed efficiently. Diseases such as yellow fever and malaria are transmitted through the saliva of specific species of mosquitoes. However, HIV lives for only a short time inside an insect and, unlike organisms that are transmitted via insect bites, HIV does not reproduce (and does not survive) in insects. Thus, even if the virus enters a mosquito or another insect, the insect does not become infected and cannot transmit HIV to the next human it bites.
http://www.cdc.gov/hiv/resources/factsheets/transmission.htm

Answer 2

HIV doesn't survive in insects.


When a mosquito bites you, it only injects saliva into the skin so it can feed better. HIV doesn't survive long enough in the insect to be injected by its saliva.

Even if the person is HIV positive, mosquitoes don't normally travel from one person to another after ingesting blood. The insects need time to digest the blood meal before moving on.

Answer 3

because of the nature of the virus. It requires a very specific set of conditions to remain alive, and being in the body of a mosquito doesn't meet those conditions.