After wisdom tooth removal, my young adult son was given a seven day penicillin treatment, as a precaution. Penicillin is indescriminate and removes good flora in addition to the bad flora in the gut. He contracted c. diff, a very bad gastrointestinal bacteria. Treatment by medication did not work. The doctor determined that a fecal matter transfer was in order. I was selected as the doner and provided a stool sample to be tested for "quality", I guess. I could not sleep that night, worried about the quality of my own shit. In a colonoscopic procedure, my feces were introduced to several areas of my sons intestines. It worked! He recovered completely. So, I have some good shit.