[CobaltBlue]

Maybe chimps and dusty mangabeys both got a human virus from Europeans which recombined in both to make SIV/HIV-1 and SIV/HIV-2, respectively? Something as innocuous to us as the common cold?

This is a total WAG but I was wondering when SARS did not break out into Europeans whether there was something similar going on.

[VadeRetro]

This story points to evidence that "a boom in bushmeat" is creating opportunities for species-jumping. Also, lots of SIV genetic diversity.