This study will assess the efficacy of oral vancomycin prophylaxis in preventing recurrent Clostridium difficile infection in hospitalized patients requiring oral or intravenous antibiotics for a suspected or confirmed bacterial infection.

This study will assess the efficacy of oral vancomycin prophylaxis in preventing recurrent Clostridium difficile infection in hospitalized patients requiring oral or intravenous antibiotics for a suspected or confirmed bacterial infection.

Inclusion Criteria:

1. Age ≥18 years
2. Previous CDI diagnosis
3. Current admission with a suspected or a confirmed bacterial infection requiring antibiotics

Exclusion Criteria:

1. Active chronic diarrheal illness (eg, Crohn's disease, ulcerative colitis, short bowel syndrome)
2. Previous adverse reactions to oral vancomycin
3. Requiring metronidazole during hospitalization
4. Known pregnancy
5. Expected survival <72 hours
6. Patients receiving antibiotics only for surgical prophylaxis
7. Patients who received prophylactic oral vancomycin for the current antibiotic course prior to enrollment in the study