Just went on a family vacation where my little brothers were playing a game on their iDevices.
The game - not giving it any specific advertisement - revolves around you "building" a disease meant to kill everyone on Earth. It gives you 3 categories on how the disease is perceived; Infectivity, Severity, and Lethality.
As Severity increases, the world becomes aware of the disease, the higher the severity the greater the focus the world has on finding a cure. So to combat this, you "devolve" traits that increase severity until the world doesn't care anymore or cares less than you want it to so infection continues.
Keeping on this fine line of severity until everyone in the world is infected, and then you "evolve" traits that kills everyone within minutes, winning you the game.
It seems HIV is taking a page out this games strategy book and sayin "Hey! Don't look at me, I won't kill you for another 20 years! Look at that guy over there first! (heuheuheuheu)".