Rakghoul plague

Rakghoul disease was a unique disease that could only be contracted by being attacked by a Rakghoul. It could only be cured a special serum that Sith troopers had. During his quest to get off of Taris, Revan found the serum on the corpse of a dead trooper. After taking it to the Upper City doctor, Zelka Forn, Form was able to mass produce and sell it for a very low price.

Appearances

 * Star Wars: Knights of the Old Republic