['clostridium difficile infection']
['cadazolid', 'vancomycin', 'cadazolid-matching placebo', 'vancomycin-matching placebo']

        Inclusion Criteria:

          -  Signed Informed Consent.

          -  Male or female ≥ 18 years of age. Females of childbearing potential must agree to use
             an adequate and reliable method of contraception.

          -  Subject with a diagnosis of mild-moderate or severe CDAD (first occurrence or first
             recurrence within 3 months) with: Diarrhea: a change in bowel habits with > 3 liquid
             or unformed bowel movements (UBM) within 24 hours prior to randomization, AND Positive
             C. difficile toxin test on a stool sample produced within 72 hours prior to
             randomization.

        Exclusion Criteria:

          -  More than one previous episode of CDAD in the 3-month period prior to randomization.

          -  Evidence of life-threatening or fulminant CDAD.

          -  Likelihood of death within 72 hours from any cause.

          -  History of inflammatory colitides, chronic abdominal pain, or chronic diarrhea.

          -  Antimicrobial treatment active against CDAD administered for > 24 hours except for
             metronidazole treatment failures (MTF)

          -  Known hypersensitivity or contraindication to study drugs, oxazolidinones, or
             quinolones.

          -  Unable or unwilling to comply with all protocol requirements.

          -  Any circumstances or conditions, which, in the opinion of the investigator, may affect
             full participation in the study or compliance with the protocol
      