On 18 May 2011, the Centers for Disease Control and Prevention (CDC) published a graphic novel, Preparedness 101: Zombie Apocalypse providing tips to survive a zombie invasion as a "fun new way of teaching the importance of emergency preparedness".
The article does not claim an outbreak is likely or imminent, but states: "That’s right, I said z-o-m-b-i-e a-p-o-c-a-l-y-p-s-e. You may laugh now, but when it happens you’ll be happy you read this...." The CDC goes on to summarize cultural references to a zombie apocalypse. It uses these to underscore the value of laying in water, food, medical supplies, and other necessities in preparation for any and all potential disasters, be they hurricanes, earthquakes, tornadoes, floods, or hordes of zombies.
Some zombie fans continue the George A. Romero tradition of using zombies as a social commentary. Organized zombie walks, which are primarily promoted through word of mouth, are regularly staged in some countries. Usually they are arranged as a sort of surrealist performance art, but they are occasionally organized as part of a political protest.