Project Purgatory.

A virus manufactured by the military, code-name, Project Purgatory, accidentally wipes out mankind leaving a handful of survivors. The virus has turned the infected humans into raging,savage cannibals. These horrendous, creatures roam the earth in hordes looking for human flesh to feed. The survivors do their best to lead a normal life in a violent, bizarre and hostile world, when a stranger with weapons holds answers to the deadly plague.