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Related Experiment Video

Updated: Dec 24, 2025

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Published on: September 14, 2013

Controversies in Clostridium difficile testing.

Daniel P Fedorko¹

¹Microbiology Service, Warren Grant Magnuson Clinical Center, National Institutes of Health, Building 10, Room 2C385, Bethesda, MD 20892-1508, USA.

Clinical Microbiology Newsletter

|April 15, 2020

Summary

Toxin A-deficient Clostridium difficile strains can cause disease, leading to misdiagnosis if only toxin A is tested. Laboratories should implement guidelines for rejecting repeat or formed stool specimens to optimize C. difficile testing.

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Last Updated: Dec 24, 2025

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

Published on: June 15, 2018

Area of Science:

Clinical microbiology
Infectious diseases
Diagnostic laboratory science

Background:

Nosocomial outbreaks of Clostridium difficile-associated disease (CDAD) have been linked to toxin A-deficient strains.
Diagnostic assays solely detecting toxin A may misdiagnose CDAD cases caused by these emerging strains.
Inaccurate diagnostics risk patient care and institutional outbreak management.

Purpose of the Study:

To highlight the diagnostic challenges posed by toxin A-deficient Clostridium difficile strains.
To emphasize the need for updated laboratory diagnostic strategies for CDAD.
To advocate for evidence-based laboratory practices to improve diagnostic accuracy.

Main Methods:

Review of published data on Clostridium difficile epidemiology and diagnostics.
Analysis of laboratory testing protocols and their limitations.
Evaluation of specimen rejection criteria for C. difficile testing.

Main Results:

Toxin A-deficient Clostridium difficile strains are confirmed etiological agents of CDAD.
Laboratories relying solely on toxin A detection risk significant diagnostic errors.
Published data support the rejection of repeat stool specimens within 7 days and formed stools for C. difficile testing.

Conclusions:

Diagnostic assays must evolve beyond toxin A detection to accurately identify all C. difficile infections.
Implementing evidence-based specimen rejection policies can improve laboratory efficiency and reduce C. difficile testing workload.
Updated laboratory guidelines are crucial for accurate CDAD diagnosis and effective infection control.