Risk Factors for Post-FMT Antibiotic Use in Recurrent C. difficile Infection

Overview

This prospective multicenter study of 448 patients identified key risk factors for non-Clostridioides difficile infection (non-CDI) antibiotic use within 2 months after fecal microbiota transplantation (FMT) for recurrent CDI. Immunocompromised status, multiple prior non-CDI antibiotic courses, and prior hospitalization for CDI significantly increased the likelihood of post-FMT antibiotic exposure, which is associated with increased risk of CDI recurrence.

Background

Clostridioides difficile infection (CDI) often recurs due to antibiotic-induced disruption of the gut microbiota. Fecal microbiota transplantation (FMT) effectively restores microbial balance and prevents recurrence. However, additional antibiotic use post-FMT can impair microbiota restoration and increase CDI recurrence risk. Identifying patients at risk for post-FMT antibiotic exposure may guide tailored prevention strategies.

Data Highlights

Key Findings

• Non-CDI antibiotic use within 2 months post-FMT occurred in approximately 10% of patients.
• Immunocompromised patients had more than double the odds of receiving non-CDI antibiotics post-FMT.
• Patients with more than three prior non-CDI antibiotic courses before FMT had over threefold increased odds of post-FMT antibiotic exposure.
• Prior hospitalization for CDI doubled the risk of non-CDI antibiotic administration after FMT.
• The most common indications for post-FMT non-CDI antibiotics were urinary tract infections, respiratory infections, and procedural prophylaxis.
• Post-FMT non-CDI antibiotic exposure significantly increases the risk of CDI recurrence.

Clinical Implications

Clinicians should recognize immunocompromised status, extensive prior antibiotic exposure, and previous CDI hospitalizations as risk factors for post-FMT antibiotic use, which may compromise FMT efficacy. These patients may benefit from enhanced antimicrobial stewardship and consideration of additional or alternative strategies to prevent CDI recurrence. Close monitoring and judicious antibiotic prescribing post-FMT are warranted to optimize outcomes.

Conclusion

Non-CDI antibiotic use following FMT is common in high-risk patients and is associated with increased CDI recurrence. Identifying patients at risk allows for targeted interventions to improve FMT success and reduce recurrent CDI.

References

1. Kelly et al. 2023 -- Identifying Risk Factors for Post-Fecal Microbiota Transplant Antibiotic Use in Patients with Recurrent Clostridioides difficile Infection