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Updated: Dec 30, 2025
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A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
Published on: May 25, 2017
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Implementing a Clostridium difficile testing algorithm and its effect on isolation duration and treatment initiation:
Erik Hans Vogelzang1, Jacqueline Marleen Lankelma2, Rosa van Mansfeld2
1Department of Medical Microbiology and Infection Control, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands. e.vogelzang@amsterdamumc.nl.
Summary
Introducing a glutamate dehydrogenase (GDH) test significantly reduced Clostridium difficile infection (CDI) isolation time. This rapid screening test effectively identifies patients who do not require isolation, improving patient care.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Healthcare Management
Background:
- Clostridium difficile infection (CDI) diagnosis often leads to prolonged contact isolation.
- Current diagnostic pathways may result in unnecessary isolation for patients without active CDI.
Purpose of the Study:
- To evaluate the impact of introducing a random-access glutamate dehydrogenase (GDH) test on reducing patient isolation time for suspected CDI.
- To assess the association between toxin A&B enzyme immunoassay (EIA) results and the initiation of antibiotic treatment for CDI.
Main Methods:
- A retrospective pre- and post-implementation study design (June 2016 - June 2018).
- Pre-implementation: Nucleic acid amplification test (NAAT) only. Post-implementation: GDH test, followed by toxin A&B EIA and NAAT if GDH was positive.
- Contact isolation discontinued if GDH test was negative.
Main Results:
- Median isolation time decreased from 50.8 hours pre-implementation to 28.0 hours post-implementation (p < 0.001).
- The GDH test demonstrated a high negative predictive value (98.8%), suitable for discontinuing isolation.
- Toxin A&B EIA results had limited added value in guiding antibiotic treatment decisions for CDI.
Conclusions:
- Implementing a random-access GDH screening test significantly reduces patient isolation duration for suspected CDI.
- The GDH test is a reliable tool for determining the discontinuation of contact isolation.
- Diagnostic strategies for CDI can be optimized to minimize unnecessary isolation and resource utilization.
