Thank you Erika. I will look for responses from those you listed. In the meantime, I will follow the link to the previous discussion.
to answer your question, the subject of retesting has not come up yet. I have not gotten to an Infectious Disease doctor yet. My surgeon (from the surgery in October in which I was given an antibiotic which resulted in the cdiff) is still managing this. He has been in contact with an ID who instructed him on the taper that I am on now.

I am 63 y/o male who had a small part of colon removed late October (there was a polp in the neck of my appendix where it attaches to the colon that could not be removed during a colonoscopy). They had to take the neck of the appendix (and the appendix) and a small portion of the colon off to make sure they got the polyp. Surgery went great. I was told after the surgery that my bowels would not return to normal from anywhere from 3 days to 3 months and to expect diarrhea and loose stools over that time. I was put on a soft diet until they returned to normal. I had one stool 2 days after surgery and it was very loose, Then 3 days after the surgery I had severe diarrhea. It was like during colonsocpy prep, but painful in abdomen. I thought it was part of the recovery, thinking each day it would get better. I didn't say anything for 2 weeks (I know, I'm an idiot), and I just stopped eating. At two weeks I questioned the surgeon whether this was normal recovery and he said no, that it sounded like cdiff. They took a stool sample, and the test was positive for cdiff. But the result was not returned for another week, so I had watery diarrhea with small carmel colored flecks in it for 3 weeks. Lost 12 lbs. My surgeon put me on vancomycin for 10 days. My stools never returned to normal, never firm formed stools, just mostly loose, but, again, I was told this was all part of the colon surgery recovery now complicated by cdiff. I simply did not educate myself at this point (regrettably). Over the twelve days that followed the last dose of vancomycin my stools, which never returned to normal, steadlily increased in loosness and began smelling like cdiff, so I called my surgeon. He recommended another test and in the meantime he would put me on another course of vancomycin. I asked if there was something else becasue I thought the vancomycin was causing prostatitis type issues. He did not think that was possible but I persisted so he prescribed 10 days of metronidazole. The results came back four days later as "positive PCR, but negative toxin." He thought it might be false negative because of my descripton of the stool looseness and smell, so he had me I finish the metronidazole. Toward the end of the metronidazole, my stools showed a little improvement (if partially formed and semi firm are improvements), but they fluctuated between that and very loose. Afer I finished the metronidazole, the stools steadily loosend and four days after the end of the metronidazole they started to become watery and by eight days after the metronidazole I was going every hour or two and they all were watery diarrhea with only flecks. My surgeon put me on a 14 day course of vancomycin and said he would talk to an ID regarding seeing me and discussing a taper at the end of the 14 day course. The ID said they did not need to see me because they would just do the same as the surgeon --put me on vancomycin (though they told him only a 10 day course) and they would not see me until I failed vancomycin twice, at which time they would consider either a third round of vancomycin or possibly fidaxomicin. My surgeon later talked to them and they apparently agreed on a taper at the end of this 14 day course. I am in the second week of the taper. (1st week 2 125mg a day; 2nd week 1 125 mg a day; 3rd and 4th week 1 125 mg every other day).