src-wikipedia-corrupted-blood-incident source
Corrupted Blood incident
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World of Warcraft, 13 September to 8 October 2005; Hakkar's Corrupted Blood debuff (263-337 damage every two seconds, spreads to nearby characters, no immunity) escaped Zul'Gurub via suspended pets and fast travel to cities; quarantines partly bypassed; servers hard-reset after about a week; pets made immune on 8 October.