J. Thomas LaMont quotes:

Testing stools for C. diff in patients after they have finished their Flagyl or Vanco for 10 days and after their bowel movements have returned to normal (that is, formed and not watery) is a waste of time and money, and is not helpful to the doctor or patient.

Among frail, elderly patients, C. diff can be fatal in approximately 5-10%. Some patients with severe C. diff end up losing their colon and have a permanent bag on their side to catch bodily waste, via a procedure known as an ileostomy.

C. diff can sometimes be life-threatening, even in healthy young adults.