To be fair, the global death toll wasn't equally distributed, and there WERE maps redrawn in the wake of VITAS.
Madagascar was wiped out by VITAS. The plague also destroyed the French economy, which let the new corp culture in. The destabilization played a role in Quebec being able to secede. Mexico disintegrated, giving rise to Aztlan. The US was weakened greatly, which helped SAIM get going. Indonesia disintegrated. It led to the breakup of China. And then there's Africa.
There was a lot of stuff that happened, but there was medicine that proved to be effective, and that medicine was spread through wealthy areas of the First World. VITAS may not have been big enough to wipe out most of the first world, but it leveled most of the third world, and put cracks in the foundation of the first world that led to many of the changes that came later.