Every zombie book or movie has a basic approach to zombies with slight alterations in each version.
+ Non-airborne virus
+ Will reanimate those who were infected and then died
+ Animals infected with the virus will die and not reanimate
+ Memory from the infected person is lost after initial death
+ Undead will only follow the most basic survival instinct, the hunt for food
+ The physical abilities of the zombies are those their body is capable of
+ No super-human effects donned by the infected
+ The undead do not know emotions and do not get fatigued
+ They exist until the head is removed or the brain is destroyed