Percentage of subjects with 3 or fewer unformed stools for 2 consecutive days and maintained through the end of therapy, and the subject no longer needed specific anti-Clostridium antibacterial treatment after completion of the course of study medication.

Analysis data is modified intent to treat (mITT) population. The mITT population consists of subjects that had CDAD confirmed by >3 unformed bowel movements in the 24 hours prior to randomization and a positive toxin assay and received at least one dose of study medication.

Percentage of subjects with the re-establishment of diarrhea to an extent(based on frequency of passed unformed stools) that was greater than that noted on the last day of study medication, and the demonstration of either toxin A or B or both of C. difficile, and retreatment with CDI anti-infective therapy was needed.

The analysis population is mITT, for subjects who met the primary endpoint of cure, was analyzed for the recurrence rates of diarrhea up to the Poststudy Visit.

Achieving a cure response at end of treatment and not having a recurrence at any time up to the post-study visit.

The analysis population is mITT, subjects that achieved a cure response at end of treatment and not having a recurrence at any time up to the Post-study visit.