From the BBC:
“A deadly virtual plague has broken out in the online game World of Warcraft. Although limited to only a few of the game’s servers the numbers of characters that have fallen victim is thought to be in the thousands.
Originally it was thought that the deadly digital disease was the result of a programming bug in a location only recently added to the Warcraft game.
However, it now appears that players kicked off the plague and then kept it spreading after the first outbreak.”