Erabus Prime was visited by Vash while in the company of Q. Vash was bitten by an insect on the planet that would have caused horrible sores to appear all over her body, were it not for Q's intervention.
The infection could be sub-divided into three stages. At the first stage, the patient lost most of his scalp hair, except for a few strands. During the second stage, oozing boils appeared all over the body. Finally, during the third stage, the patient began to shiver, was no longer able to walk and skin and hair turned gray. (DS9: "Q-Less")
|Three stages of Erabus Prime bug infection|
|Stage 1: Loss of hair||Stage 2: Oozing Boils||Stage 3: Shivering and gray skin + hair|