But there are parallels to be drawn, and professors say that the zombie plague worked a little closer to real life than Hakkar's corrupted blood did (no coincidence, I'm sure, that the zombie plague was designed to be spread, while the Corrupted Blood was basically a bug). While the plague never did really infect everyone in the world, it did spread pretty quickly -- apparently there's a number you can use to track how quickly a disease spreads, and the zombie plague landed in the arena of a normal outbreak of smallpox (given, of course, that we don't know exactly how fast or how widely it spread).
Very interesting. There is still more to say about this plague, I think (and though things have slowed down on the realms, hopefully the event itself isn't completely over). But it is fascinating how Blizzard turned emergent gameplay into an official event, and how they mimicked the real-life qualities of a spreading disease (the more of it around, the more likely you were to pick it up) while still leaving the idea firmly grounded in the in-game lore. Very cool indeed.