At the time, I suggested some dialogue that would have fixed the problem:
NAVY SEAL COMMANDER
Zombie starts with the letter "Z," and they're all over the world.
It's like...World War Z.
Anyway, I finally got around to reading the book. Guess what? "World War Z" is named in the first sentence. (It wasn't as elegant as my approach, but I'll take it.)
See, folks. This is why books are better than movies.