This includes items and quests that can no longer be obtained.
The in-game information in this article is kept purely for historical purposes and should probably not be under any other categories.
Wandering Plague
When your diseases damage an enemy, there is a chance equal to your melee critical strike chance that the wil cause X% additional damage to the target and all enemies within 8 yards. Ignores any target under the effect of a spell that is cancelled by taking damage.
When your diseases damage an enemy, there is a chance equal to your melee critical strike chance that the wil cause X% additional damage to the target and all enemies within 8 yards. Ignores any target under the effect of a spell that is cancelled by taking damage.
Edit
Patch 3.0.8 (2009-01-20): Now properly resets after being cast. 
