The CDC webpage starts with this:
We’ve all seen at least one movie about flesh-eating zombies taking over (my personal favorite is Resident Evil (External Web Site Icon. [rate:6.4] 78,991 votes), but where do zombies come from and why do they love eating brains so much?
...The Zombie Survival Guide identifies the cause of zombies as a virus called solanum.
While I agree that Resident Evil (the first one) might be my favorite movie as well, we need to thank the spread of the Zombie Survival Guide to image boards like 4chan.org. Many meme's start from its sundry (and not all safe-for-work) pages, including the infamous "you got Rick Rolled" meme.
KnowYourMeme.com explains the origins of a now ubiquitous Zombie Survival Sheet on 4chan.
According to the Lurkmore wiki the meme originated from the 4chan’s /k/ board, a board about weaponry, around the late October 2008.
The board began to be invaded by what they called “zombie threads” in which they were asked to give pieces of advice about the best weaponry choice and plan when facing a zombie outbreak. It was usually resulting in a division between those who wrote the most accurate response they could find and those who didn’t believe in zombies, leading to fiery arguments between the two.
...The 29th of October 2008, the meme went to /b/ where another zombie thread popped up. There, the picture began to be reused to fulfill the requests.
It then came back to the /k/ board, having more and more threads created.
Instantly, the meme expanded to other boards and other chans, mainly those that got a zombie board.
That kind of zombie threads, since then, are always present on a regular basis on 4chan as well as other boards.
It's now almost 24 hours since the CDC tweeted about zombie preparedness, and it's still trending worldwide. In the 30 seconds it took to snap the picture, over 100 new tweets mentioning the CDC zombie preparedness guide rolled in.
Two opinions on this PR coup by the CDC:
1. Whomever had the idea for this should get a raise and promotion. Good fresh thinking needed in the government.
2. This provides a great avenue to remind the public that the CDC isn't wholly comprised of staid, stogy professors sitting in laboratories doing esoteric research. It very much is comprised of smart and lively men and women who often live and do very interesting things. They are much more than the sparse natural disaster warnings that we read about.
For example, the CDC Epidemic Intelligence Service (EIS) is a 2-year postgraduate fellowship for applied epidemiology. Eyes glaze over? Let me tell you again. The EIS is a small group of people who leave at the drop of a hat to investigate outbreaks like SARS and Ebolla. They fly INTO the eye of the storm while everyone else wants to get away from the diseases. Pretty cool, eh?
Congratulations, CDC, on a job well done. Now, back to polishing my AA-12.
*I'll also add a shout out to President Obama, who, for reasons he's responsible for or not, has presided over a government that has made progress by leaps and bounds in the "use of social media" and "awareness of target culture" departments.