What would stop Al-Queida from getting their hands on this once it becomes epidemic? The terrorists would go to any lengths to obtain a sample, then spread it around the US by infecting "Suicide carriers". The uses of this virus as a bioweapon is infinate to an enemy of this country, especially if the leg work was done by nature.
Probably nothing. Only idiots would you this as a weapon because there's just as much chance that it would come back to their loved ones as well. At least that's what I'm telling myself since this was announced to the world.
Al Quida lacks the knowledge/equipment for genetic engineering and the majority of those who survive (which will still be the majority of people) will be immune to the same virus (why the Spanish flu hasn't come back). Sure they could wait a few generations and unleash it again, but the majority of the deaths from this virus will be in China, SE Asia, India, Middle East, and Africa....all the poor, garbage ridden places.