World of Warcraft plague halted by Blizzard - The Times 29th October 2008

The makers of World of Warcraft, an online game with more than 11 million players, today brought an end to a virtual plague that has infected hundreds of thousands of players, causing uproar among many fans who said it was spoiling the game. Blizzard, the software company that runs the game, had deliberately introduced the virulent disease into its virtual world last week. The “undead plague” was designed to be highly contagious and, if left untreated, would turn players them into flesh-eating zombies.

Link to Article