Can Mosquitoes Spread HIV?
No — mosquitoes cannot transmit HIV, and this has been studied and confirmed repeatedly since the early years of the HIV epidemic. It's worth explaining why, since the surface-level logic (mosquitoes transmit other blood-borne diseases, so why not this one?) is understandable even though the conclusion is wrong.
Why the biology doesn't work
When a mosquito bites, it doesn't inject blood from a previous host into the next person — it injects its own saliva, which contains anticoagulants that help it feed, not blood from prior meals. HIV also doesn't replicate inside a mosquito's digestive system the way malaria parasites do, and the amount of blood on a mosquito's mouthparts between bites is far too small to transmit a meaningful viral load even if the virus somehow survived there.
The evidence supporting this
Decades of epidemiological research have found no cases of HIV transmission through mosquitoes, including in regions with both high HIV prevalence and heavy mosquito populations — if this were a real transmission route, the geographic overlap would have produced clear evidence of it by now, and it hasn't.
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