In Wrath of the Lich King it is item level 272, requires level 80 and sells to vendors for 5g 17s 4c. In MoP Classic it is item level 264, requires level 80 and sells to vendors for 5g 17s 4c.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Lingering Illness Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Lingering Illness suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Lingering Illness Fits
Other Items Named Lingering Illness
1 other item in the current build is also called Lingering Illness. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 50063 (50057 to 50069) were usually added in the same batch as Lingering Illness: the same quest line, zone, vendor or reward set.