I know scientists say that hiv can't be transmitted by mosquitos - but why so? They can transmit so many other disease, why not hiv?
Scientists have been looking into that one ever since HIV/AIDS appeared and various moquisito scenario began circulating..
It seems that a mosquito doesn't get enough of the HIV participles when biting a human. Secondly, mosquitoes don't carry the HIV stuff long in their blood because they digest it (unlike the case with, for example, malaria). And thirdly, mosquitoes don't transmit the blood from their latest meal - they transmit saliva. And if that saliva is from a malarian-carrying mosquito, malaria gets transmitted. But not HIV, because the blood with that would get sucked up into a different channel than the spit channel, and then get digested as a meal.
susila is right.
The main reason I know of, is because when a mosquito bites you it doesn't actually inject any blood in you, just saliva
