Evaluation of endoscopic processing on the potential for Clostridiodes difficile transmission

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Gastroenterology

Background:

• Clostridioides difficile (C. difficile) is a significant healthcare-associated infection, posing challenges due to its resilient spores.
• Endoscopes, particularly colonoscopes, are critical for diagnostics and therapeutics but require rigorous disinfection to prevent pathogen transmission.
• The efficacy of standard disinfection protocols against C. difficile on endoscopes remains a key concern in patient safety.

Purpose of the Study:

• To assess the effectiveness of high-level disinfection (HLD) in eliminating C. difficile from colonoscopes.
• To determine the prevalence of C. difficile colonization in patients undergoing colonoscopy.
• To investigate the presence of C. difficile toxin in patient samples.

Main Methods:

• A total of 100 colonoscopic procedures were analyzed.
• Colonoscopes were sampled before and after HLD using sterile water flushes.
• Quantitative polymerase chain reaction (qPCR) was employed to detect C. difficile DNA, complemented by aerobic cultures.

Main Results:

• C. difficile DNA was detected in 57.41% of pre-HLD samples and 48.39% of post-HLD samples.
• While cultures were negative post-HLD, qPCR indicated the presence of low levels of C. difficile DNA.
• A high prevalence of asymptomatic C. difficile colonization was observed in the patient population.

Conclusions:

• HLD significantly reduces C. difficile on colonoscopes but does not achieve complete elimination.
• The persistence of low levels of C. difficile DNA post-disinfection, with negative cultures, suggests a minimal risk of transmission.
• Routine screening for C. difficile colonization in asymptomatic patients undergoing colonoscopy may be warranted.