Necropolis.

A former Soldier and an orphaned child must fight their way through a global pandemic in order to get to the safe zone known as "Site R". Along the way, the unlikely pair encounters Marauders and government operatives who also want to see them extinct, because of the secret one of them carries. It's a race against time and test of human morality as our heros try to survive the new world known as "Necropolis."