There isn't one. At least that's the official word from the Center for Disease Control in an e-mail to the Huffington Post.
"CDC does not know of a virus or condition that would reanimate the dead (or one that would present zombie-like symptoms)." -- CDC spokesperson David Daigle.Frankly, in light of recent events, I'd feel better if there was.
We cracked wise about it HERE and pushed back against some high-horse criticism HERE.