Tainted Future. The Rememdium Series, #3

Everything they know is gone. The old world obliterated in less than forty-eight hours. They soon discover they aren't alone, and other dangers besides the undead lurk in the forests. The new law of the land: kill or be killed. Dr. Everett Berning and his team seek refuge in the underground lab in the Ozark Mountains. The first week after the collapse of civilization, those who made it out alive struggle against the odds to survive.
Only a handful escaped the devastation in their hometown of Malvern, Arkansas, and they grapple with the new reality. Tired, frightened, and mourning the loss of loved ones, they attempt to regroup and cope with the life-altering changes. When one suffers a debilitating injury, they are thrust into a tenuous relationship with Dr. Berning's group. Other survivors battle the odds as they flee treacherous cities destroyed by the government and crawling with reanimated corpses.