July 13, 2012, 3:25 p.m. ET
The Plague Behind the Zombies
The undead didn't always breed by biting. For that, the mythmakers needed rabies.
"Our vampires and zombies (as well as such poor relations as werewolves) all serve as carriers for vaguely similar saliva-borne infections. These mythical contagions are especially odd because they have so few analogues in the natural world. Indeed, there is really only one: the rabies virus."
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