Dengue, malaria, chikungunya, and zika virus are just a few diseases that can be transmitted by mosquitoes. Mosquito-borne diseases are those conditions acquired when bitten by a carrier mosquito. Fortunately, not all diseases can be transmitted through mosquitoes, human immunodeficiency virus (HIV) is one of these examples.
Infected needles and having unprotected sexual intercourse with an infected person are methods by which HIV is transmitted. A mosquito bite can not transmit the virus, even if the mosquito sucks blood from an infected person.
Why then does this happen? The answer lies in our cells. For HIV to infect a person, they attach to a special group of immune cells called T-cells, infect them then replicate. Mosquitoes do not have these T-cells, which means the virus can not be replicated. Thereafter, the virus is broken down in its digestive system before it bites again.