Check out this MMO:
The Day Before is an open-world MMO survival set in a deadly, post-pandemic America overrun by flesh-hungry infected and survivors killing each other for food, weapons, and cars. You wake up alone in a world you no longer remember, setting out to find answers and the resources to survive.
Looking like a cross between The Last of Us and The Division, The Day Before is an open world survival game coming to PC with elements of PvP and PvE, putting you against other players and the game's take on zombies called infected.
https://www.youtube.com/watch?v=xyYz8uo87I8