Over the years the Centers for Disease Control and Prevention has released a couple of tongue-in-cheek “zombie warnings,” which really are just disaster-preparedness stunts. But on Thursday, the agency made it official: Zombies don’t exist.

“CDC does not know of a virus or condition that would reanimate the dead (or one that would present zombie-like symptoms),” wrote agency spokesman David Daigle in an email to The Huffington Post.