Answer: The United States
Were it not for Dr. Levy and the pioneering work he did in California in the eighties, and the host of other American funded NIH, CDC, and University researchers, we would be no further along than Gallo's co-discovery of the HIV virus. We certainly would not have the host of HIV drugs that now exist were it not for American dollars and R&D.
We've contributed more towards ending AIDS than any other country on the planet. And for this, the world still claims 'the US isn't pulling her fair share'.
And we should say, "Mavi ya ngombe!"