While the undead currently roam the world in herds that can often stretch for miles and number in the millions, the zombies are no longer the biggest threat to humanity's continued existence. That distinction has returned to mankind.
Those who are immune to the zombie infection are now either reviled or revered. Some have become human biological weapons, while others are seen as the last hope for the continued existence of the human race. They are a symbol of hope for some...fear to others.