Fallen Earth: Baby Steps in the Wasteland with Ripper X
From the Fallen Earth site:
The beginning of the Fall is somewhat up for debate, but 2055 is the most common year cited. By the time the virus actually reached North America in 2056, war had broken out on the east coast between the United States Government and the Federal Emergency Management Agency, (which was supported by the United States military). By most accounts, the Fall was over by 2062, around the time of the death of the last President of the United States. At that point, every human being was locked away in some sealed bunker, an immune carrier of the Shiva Virus, or dead. It’s estimated that less than one out of one-hundred people survived the Fall, and even that sounds generous.