These sub-categories are created by physical aspects, length of reanimation, location of death, weather conditions, or even injuries caused by survivors unable to finish the undead off. A Zombie, in its broadest sense, is a person who has lost his or her sense of self-awareness and identity, and cares only for the destruction (and often consumption) of any human around, no matter what the circumstances, or cost to his or her self. They make up for this loss of intelligence in sheer numbers, as the state of 'Zombieism' is almost always contagious, and spreads like wildfire. Technically speaking, true zombies are always dead, and re-animated.