Investigation to identify a resource-efficient case-control methodology for determining antibiotics associated with...

Area of Science:

• Infectious Diseases
• Epidemiology
• Antimicrobial Stewardship

Background:

• Antimicrobial exposure is a significant risk factor for Clostridium difficile infection (CDI).
• Identifying specific antibiotics associated with CDI is vital for developing effective antimicrobial stewardship interventions.
• This study explored resource-efficient methods to pinpoint antibiotic targets for CDI prevention.

Purpose of the Study:

• To evaluate a resource-efficient method for identifying antibiotics associated with Clostridium difficile infection (CDI).
• To inform antimicrobial stewardship strategies aimed at reducing CDI incidence.

Main Methods:

• Employed a series of 6 focused case-control studies comparing patients with laboratory-confirmed CDI to matched controls.
• Utilized group-specific matching criteria including admission date, age, and length of stay.
• Compared demographic data and antibiotic usage between case and control groups.

Main Results:

• Piperacillin/tazobactam, ceftriaxone/cefepime, fluoroquinolones, intravenous vancomycin, azithromycin, and last-resort antibiotics were more frequent in CDI cases.
• Associations between certain antibiotics (ceftriaxone/cefepime, fluoroquinolones) and CDI weakened in the final control group, potentially due to comorbidities.
• Identified specific antibiotic classes significantly associated with increased CDI risk.

Conclusions:

• A simple matching strategy for case-control studies is an efficient and feasible method for identifying high-risk antibiotics associated with CDI.
• This approach is particularly valuable in resource-limited settings for guiding antimicrobial stewardship.
• The findings support targeted interventions to reduce the use of specific antibiotics linked to CDI.