Corrupted Blood incident
Virtual epidemic in World of Warcraft / From Wikipedia, the free encyclopedia
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The Corrupted Blood incident (also known as the World of Warcraft pandemic[1][2]) took place between September 13 and October 8, 2005, in World of Warcraft, a massively multiplayer online role-playing game (MMORPG) developed by Blizzard Entertainment. When participating in a certain boss battle at the end of a raid, player characters would become infected with a debuff that was transmitted between characters in close proximity. While developers intended to keep the effects of the debuff within this boss's game region, a programming oversight soon led to an in-game pandemic throughout the fictional world of Azeroth.
![Thumb image](http://upload.wikimedia.org/wikipedia/en/thumb/f/fe/WoW_Corrupted_Blood_Plague.jpg/320px-WoW_Corrupted_Blood_Plague.jpg)
World of Warcraft introduced the game region of Zul'Gurub on September 13. The boss of the region, Hakkar the Soulflayer, cast the debuff Corrupted Blood on raid participants, which expired when players defeated Hakkar. Corrupted Blood soon spread beyond Zul'Gurub through players by deactivating their infected animal companions, who when reactivated in densely populated non-combat zones, still carried the debuff, becoming disease vectors, while non-player characters became asymptomatic carriers. Player reactions to the Corrupted Blood pandemic varied: some provided aid by healing players or warning them of outbreak zones, while griefers intentionally contracted the debuff to spread it across the game world. After several failed hotfixes, Blizzard ended the pandemic by performing a hard reset, and a later patch prevented companions from contracting Corrupted Blood entirely.
Although it was the result of a software bug, the Corrupted Blood incident gained longstanding notoriety among World of Warcraft players and interest among real-world disease researchers. Blizzard developed intentional in-game pandemics in two expansion sets: Wrath of the Lich King in 2008 and Shadowlands in 2020. Epidemiologists, meanwhile, took interest in how MMORPGs, unlike mathematical models, could capture individual human responses to disease outbreaks rather than generating assumptions about behavior.