World Of Warcraft: Epidemiology of the Undead Plague

The plague of undeath, a product of the Lich King's morbid experiments, quickly made its presence felt after it was unleashed upon Azeroth. Its first victims were humans from a village that was unluckily situated near Icecrown Glacier. As the horrifying plague spread, it converted humans into undeath, but left the other denizens of Azeroth alive, though diseased and decaying. Was this an unintended aspect of Ner'zhul's diabolical plan, or was humanity the plague's only intended target?

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