Can HIV be transmitted by mosquitoes?

Given how mosquitoes bite multiple people in a short amount of time, it’s understandable to wonder if these insects could spread HIV.

The thought of contracting HIV from a mosquito bite can be frightening, especially in areas where mosquitoes are common and where HIV is a major public health issue. However, while mosquitoes can carry and spread certain diseases, HIV is not one of them.

Many people worry because mosquitoes suck blood, and since HIV is a virus found in blood, it’s natural to wonder if the virus could be passed from person to person through a mosquito bite.

This concern is valid, but research shows that the biology of both mosquitoes and HIV makes this form of transmission impossible.

There are a few key reasons why HIV cannot be spread by mosquitoes. First, when a mosquito bites someone, it injects saliva, not blood. HIV doesn’t survive or replicate in mosquito saliva, which is crucial for transmission of a virus through an insect bite.

When a mosquito sucks blood from someone with HIV, the virus cannot infect the mosquito or multiply within it. Instead, the virus is simply broken down and digested like any other protein that the mosquito ingests.

Another important point is that mosquitoes don’t pass blood from one person to another. After sucking blood, they do not inject that blood into their next victim. What they inject is only their saliva, which helps them feed, but it doesn’t carry HIV. As a result, even if a mosquito bites a person living with HIV, it cannot pass the virus to anyone else.

Numerous scientific studies have looked into the possibility of mosquitoes transmitting HIV. All the evidence points to the same conclusion: HIV cannot be transmitted by mosquitoes. According to experts in both HIV research and mosquito-borne diseases, the biology of HIV and mosquitoes simply doesn’t allow for transmission. Mosquitoes can spread diseases like malaria, Zika, and dengue fever, but they are not a risk when it comes to HIV.

Clearing up misunderstandings about HIV is important in reducing stigma and unnecessary fear. HIV is primarily spread through certain bodily fluids such as blood, semen, vaginal fluids, rectal fluids, and breast milk. It is not spread through saliva, sweat, tears, or casual contact like hugging or sharing food. Understanding how HIV is—and isn’t—transmitted helps people take the right precautions without being afraid of everyday encounters or mosquito bites.