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Related Experiment Video

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Direct Clostridioides difficile ribotyping from stool using capillary electrophoresis.

Colin D Lloyd1, Binal Shah-Gandhi1, Brendon D Parsons1

  • 1Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada.

Diagnostic Microbiology and Infectious Disease
|November 20, 2020
PubMed
Summary

Culture-independent genotyping of Clostridioides difficile (C. difficile) is crucial for tracking strains and outbreaks. A new PCR ribotyping method allows direct C. difficile genotyping from stool samples using capillary electrophoresis, improving speed and efficiency.

Keywords:
Capillary electrophoresisClostridioides difficileDirect Polymerase Chain Reaction ribotypingMixed C. difficileQuantitative Polymerase Chain Reaction

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Area of Science:

  • Clinical Microbiology
  • Molecular Diagnostics
  • Infectious Disease Epidemiology

Background:

  • Clostridioides difficile (C. difficile) genotyping is vital for surveillance, transmission tracking, and outbreak investigations.
  • Traditional culture-based methods for C. difficile genotyping are time-consuming and not always feasible.
  • Culture-independent methods are needed for rapid and routine C. difficile genotyping.

Purpose of the Study:

  • To develop a direct-from-stool Clostridioides difficile (C. difficile) PCR ribotyping algorithm.
  • To utilize capillary electrophoresis for efficient C. difficile genotyping.
  • To assess the performance of direct stool genotyping compared to traditional isolate methods.

Main Methods:

  • Development of a PCR ribotyping algorithm for direct C. difficile DNA extraction from stool samples.
  • Application of capillary electrophoresis for automated ribotype analysis.
  • Comparison of direct stool ribotyping results with those obtained from cultured isolates.

Main Results:

  • Direct C. difficile PCR ribotyping was successful from 66.8% of stool samples, with 33.2% requiring prior broth enrichment.
  • Lower 16S and tcdB cycle thresholds (Ct) were observed in directly genotyped samples, correlating with successful direct ribotyping.
  • High concordance (94.7%) was achieved between direct stool and isolate-based C. difficile ribotypes, with confirmation of mixed ribotypes in 6.4% of samples.

Conclusions:

  • A rapid PCR ribotyping algorithm enables direct Clostridioides difficile (C. difficile) genotyping from stool using capillary electrophoresis.
  • This culture-independent method offers a faster alternative to conventional genotyping, essential for timely outbreak investigations.
  • The method can occasionally detect mixed C. difficile populations, a limitation not typically identified with standard isolate genotyping.