Virtual Plague

The BBC reports on a virtual "corrupted blood" plague infecting the World of Warcraft. Despite attempts to eradicate the infection, the problem continues:

Blizzard tried to control the plague by staging rolling re-starts of all the servers supporting the Warcraft realms and applying quick fixes.
However, there are reports that this has not solved all the problems and that isolated pockets of plague are breaking out again.

Thanks to an unnamed source for the tip.