Probiotics for Primary or Secondary Prevention of Clostridioides difficile Infection.

Clostridioides difficile infection (CDI) is a leading cause of hospital-acquired infectious diarrhea, often triggered by disruption of the gut microbiota. Recurrence is common after antibiotic treatment, prompting interest in microbial therapies such as probiotics. While some studies suggest probiotics may help prevent initial or recurrent CDI episodes, overall evidence remains inconsistent. Data on prebiotics and synbiotics are even more limited. Although generally safe, probiotics may delay restoration of the normal microbiome, which is key to preventing recurrence. Current guidelines vary from cautious support to discouragement of their use, leaving the role of these therapies in CDI management uncertain and investigational.