Who said the government would be responsible for this, or that the 1% would be spared? Ideally, the disease probably shouldn't come from a ruling body (because lord knows SOMEONE in there will diddly it up somehow, and besides, I'm psure govt's aren't allowed to do stuff like that), and it should affect human beings indiscriminately, regardless of class. In other words, make it highly contagious and release it just about everywhere. (Oh yeah, and its changes should be irreversible, so all the money in the world won't make a difference.)
I'm curious now... what do you think is the worst that could happen if, say, a third of the global population was rendered infertile? I've never taken much time myself to figure out the effects that would have on just about everything.