If you haven't heard of DAZW, its a game where a virus has taken place that infects all that have died. It remains in a host until they pass away. (the virus does not kill them) They are then ressurected into a zombie, some with mutations or special abilities.

After Bill And Joe Defeated A Source Instead of Dying Normally Like The Game Does, It Released A Final Attack By Teleporting Bill, Joe, The Survivors And The Bus Cloning Machine, Into Another World Where They Thought Can Call Home, Oh How Wrong They Were