when the dust settles in China, the largest population on earth will be left with strong survivors IMMUNE to this Bioweapon and a virtually unstoppable army.   Nope.  Read about what happens regarding re-infections. I find the possibility that it was a Chinese $-vaccine-$ development trial gone very wrong more plausible than a purposeful biowarfare attack on their own people.  THAT makes no sense, unless you're writing a movie script.