Hi and sorry you got the run around. You can carry C. difficile and if you don't have symptoms and since you don't have the toxin B then you don't need treatment. So, if you don't have symptoms you don't need the antibiotic. If you want to finish the course of metronidazole for the parasite you can even though they didn't find one. Sometimes it takes several specimens to find one. Do you have diarrhea? If so, how often do you have diarrhea per day? Or are you over it?
take care,
mkh9