If I am reading everything correctly and I may not be, If you are dealing with a Ghoul bit you can take a full action to make 2 initial saves. The first save is for Paralysis (DC12 Fort save or be paralyzed for 1d4 rounds) and the second is for the Ghoul Fever. The Ghoul Fever save is a DC12 Fort save that you can make once per day and it is on the physical track(pg.414CRB) What I take that to mean is on failure of your first save after the bite the disease is Latent. The following day when you make your second save failure means the disease progresses to the weakened stage, success on the save means it is Cured. The third day of making a save means that failure moves it to Impaired while sucess moves it to Latent. Progress continues until the player successfully cures themselves( or is cured) or they die. Bonus: If they do end up dying maybe consider giving them the Ghoul graft. They can raise up 24hrs after their death and carry on with the mission giving you a whole bag of plot hooks and curve balls to throw at the party.