one interesting thing about zombies is that the modern version have a lot more to do with folkloric vampires--the kind older than Dracula, Carmilla, and Varney. The folkloric type were rotting, unintelligent, undead things that fed on family and neighbors with no thought or reason, just a desire to consume. While vampires had begun to change in the popular consciousness to what we picture now, it wasn't until Night of the Living Dead that zombies started gaining these traits. One interesting example of the beginnings of this shift is Richard Matheson's I Am Legend, which reads like a classic zombie survival narrative of a disease wiping out the human population and turning them into the seemingly mindless undead, except that Matheson calls them vampires.