
Blizzard sure has a thing for the “spread”. However, the Zurg’s ability to spread and infect was nothing compared to a glitch Bizzard set loose on World of Warcraft.
Back in 2005, programmers released a patch with a quest called “Zul’Gurub”. Meant to be difficult and achievable only by high level characters, it culminated with a showdown with the quest’s final boss: Hakkar the Soulflayer.
During the battle, Hakkar would debuff the attacking characters with a curse called “Corrupted Blood”. It quickly sapped the characters health, and while annoying at best, could kill a lower lever character in seconds.
However, this curse spread to nearby allies. Soon your entire party would be infected and your healer would have his hands full. However, something happened that Bizzard didn’t intend.

Supposed to be contained, characters were able to teleport out ofthe Zul’Gurub area. The infection followed and soon characters that hadn’t even gone to Zul’Gurub were being infected.
To perpetuate the spread, NPC’s could catch Corrupted Blood, but couldn’t die from it, spreading it to other PC’s. Pets could spread the disease in places the player couldn’t go.
Soon, bodies lined the streets of major cities and towns. Healers volunteered their abilities, other characters helped enforce quarantines, and many players fled populated areas or quit playing altogether.
Unfortunately, some players intentionally spread the disease. Quarantines became unenforcable. The entire epidemic infected three servers and forced Blizzard to reset WoW from the inside.
Implications
Because people in WoW are usually quite passionate about their characters, they reacted in a way that was typical of a real pandemic. However, because people were really reacting it made the real world wonder something: What if this happened in the real world?
The Center for Disease Control and the Department for Homeland Security teamed up with an epidemiologist named Nina Fefferman to study the effects of this virtual plague. With people reacting to this scenario in a real-world way, we hope they can garner clues against the chance that this hits us in a not-so-virtual way.
Lets just say, you can’t reset the world.