I’m walking through a world in ruins. Disease has ravaged humanity; one single disease that’s wiped out most of the human race. There is a quarantine area that spans 4 zones. These zones are the size of small countries where those that have the disease live in slums and squalor. Outside the zone the few unaffected live in relative comfort.
Each zone is a different stage of the disease with zone four being for those in the last few months before death. People are forced to go into zone one if they contract the illness. They are moved from each zone as the disease slowly kills them. Nobody wants to move down the zones but the others that live there force them to for fear of their own illness worsening. This makes the zones dangerous and violent.