Clostridium difficile in the normal adult faecal flora

Area of Science:

• Microbiology
• Clinical Pharmacology

Background:

• Clostridium difficile is an opportunistic pathogen.
• Antibiotic use, such as clindamycin, can disrupt gut microbiota and increase C. difficile colonization.
• Understanding C. difficile dynamics during and after antibiotic treatment is crucial for infection control.

Purpose of the Study:

• To investigate the prevalence and shedding patterns of Clostridium difficile in healthy volunteers following oral clindamycin administration.
• To determine the duration of C. difficile excretion post-clindamycin treatment.
• To assess the relationship between serum clindamycin levels and C. difficile shedding density.

Main Methods:

• Culture-based investigation of faecal specimens for Clostridium difficile.
• Administration of oral clindamycin to healthy volunteers.
• Monitoring of C. difficile excretion before, during, and after clindamycin treatment.
• Measurement of serum clindamycin levels (peak and trough).

Main Results:

• 177 out of 324 routine faecal specimens were positive for C. difficile.
• 12 of 36 volunteers initially harbored C. difficile.
• All volunteers excreted C. difficile during clindamycin administration.
• 16 of 36 volunteers continued to excrete C. difficile three months after treatment.
• No correlation was found between serum clindamycin levels and C. difficile shedding density.

Conclusions:

• Oral clindamycin significantly increases Clostridium difficile excretion in healthy individuals.
• C. difficile can persist in the gut microbiota long after antibiotic treatment has ended.
• Clindamycin therapy did not lead to the development of C. difficile-associated diseases in this cohort.