[Doctor Stochastic]

The epidemiologists that I have talked to tell me that there is no evidence of a mosquito vector at all. There aren't enough childred being infected to blame mosquitos. The distribution of infection should look like malaria or yellow fever or west nile if mosquitos were a vector.

This doesn't mean that such a vector could not arise.

[tortoise]

The epidemiologists that I have talked to tell me that there is no evidence of a mosquito vector at all.

Totally possible. This was a couple years ago. There were two relatively isolated locales that apparently did have an infection pattern compatible with a mosquito vector that they were very interested in. However, there could be other social/cultural causative factors. Hell, there are isolated populations in the nether regions of the U.S. where the HIV infection rate is >70% (like on some Indian reservations). Depending on local practice and custom, you could find HIV in literally anyone, which may have been the case here.