Players would disperse the effect to other people

A week after the outbreak, it forced Blizzard to wow gold classic restart every WoW server to stop it from spreading out of control.

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The infection originated from Hakkar the Soulflayer -- the boss of the very first 20-player raid Blizzard released. Hakkar would cast Corrupted Blood on players and it would damage them for approximately ten seconds. Players would disperse the effect to other people when they got too near those infected. After the 10 seconds were done, or players completed the boss battle, the harmful impact was supposed to end. Only it didn't.

A programming oversight allowed the debuff to spread beyond the website of this Hakkar boss fight and to the world at large. Much like rats fueled the Bubonic Plague, personalities' trained animals spurred the Corrupted Blood outbreak. Hunter characters may summon and discount pets to fight at their side at will. Once ignored, all of the effects on the pets have been paused until it's called back out again. In consequence, the critters would contract Corrupted Blood during the boss fight, disappear then display the symptoms elsewhere in the world map when they were again summoned. There it would spread to other players and pets that came in contact with them.

Cities such as the dwarven town Ironforge and orc town Orgrimmar were overrun within hours. Non-playable personalities, who could not die due to special coding, would also catch the effect, meaning any participant who passed by them could get Corrupted Blood.

Afterword got out, players hunted frantically for cheap classic gold wow news about what was happening.