This is Day Z. This is your story.

A 225 km2 open world post-soviet state and one of the areas hit by a new and presently unknown infection which has wiped out most of the world's population. You are one of the few who have survived and now you must search this new wasteland in order to fight for your life against what is left of the indigenous population, now infected with the disease.

Day Z mod website[dayzmod.com]