A peste rakghoul.
The rakghoul plague or rakghoul disease was a disease engineered by the ancient Sith Lord Karness Muur, it could turn most nearby sentient beings into a mindless rakghoul, a Sith-spawned mutant. The virus-like plague, carried by every rakghoul in existence at the time, could be spread to another being by a bite or a scratch from a rakghoul's claw. The victim would then suffer through an incubation period lasting approximately six to forty-eight hours before being transformed into a rakghoul, one fully capable of spreading the Sith-made disease on to further victims. -Wookieepedia
Como em muitas doenças graves no mundo real, houve casos de cura nos estágios iniciais de incubação, mas uma vez que se transformou em rakghoul, era incurável.
Isso está em Legends.