My 27 year old son tested positive for c diff after 4 round of antibiotics over the period of 3 months. He didn t have any of the normal symptoms such as fever diahrria. He did one time about a month ago have blood in his stool. He was put on another antibiotic med.... something to treat the c diff. Today was his last of a 2 week script. This morning he had a bloody stool and has been having pain in his sides and sometimes his back. Before the c diff diagnosis he had a CT scan for kidney stones...no stones. How long do we wait to see if this will go away before going on to something else? Dr said he may have to have a colposcopy if he s not better in a week or so...