Read The Rising of the Dead Storyline:
When a catastrophic natural disaster looms on the near horizon, the government releases an airborne virus designed to make the human race better able to survive. Those that do survive are picking up the pieces of their world, and those that have died lay in their death sleep, but in their bodies the virus works on, mutating, setting the stage for a second catastrophe far worse that the first.Pages of The Rising of the Dead :