Bacteriophage and bacteriocin typing scheme for Clostridium difficile.

Area of Science:

• Microbiology
• Epidemiology
• Virology

Background:

• Accurate typing of Clostridium difficile isolates is crucial for understanding infection spread.
• Current typing methods may have limitations in differentiating strains effectively.

Purpose of the Study:

• To identify and characterize bacteriophages for typing Clostridium difficile strains.
• To evaluate the utility of bacteriophages as a tool for C. difficile epidemiology.

Main Methods:

• Bacterial isolates of Clostridium difficile were exposed to mitomycin C to induce bacteriophage production.
• Filtrates were tested for lytic activity (plaque formation) against other C. difficile strains.
• Phage preparations were analyzed using electron microscopy; bacteriocin activity was also assessed.

Main Results:

• Lytic bacteriophages were isolated from 10 C. difficile strains, demonstrating plaque-forming activity.
• Electron microscopy confirmed the presence of tailed phage particles.
• Bacteriocin activity was observed in 20 strains, distinct from plaque-forming lysis.
• Isolates from the same patients over time showed similar phage sensitivity, while geographically distinct isolates varied greatly.

Conclusions:

• Bacteriophages exhibit lytic activity against Clostridium difficile and are suitable for strain typing.
• Phage typing of C. difficile provides a valuable tool for epidemiological investigations.
• The observed patterns suggest phage sensitivity can be a stable characteristic for strain differentiation.