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PCR Cycle Threshold-Guided Management of Pediatric Clostridioides difficile Infections

Mohammed Suleiman1,2, Andrés Pérez-López1,3, Neama Esmat Salieh1

  • 1Department of Pathology, Sidra Medicine, Doha P.O. Box 26999, Qatar.

Microorganisms
|February 27, 2026
PubMed

Insights

A PCR cycle threshold (Ct)-guided approach accurately identifies pediatric Clostridioides difficile infection (CDI) and reduces unnecessary antibiotic treatment. This strategy improves diagnostic precision and limits inappropriate use in children.

Area of Science:

  • Clinical microbiology
  • Pediatric infectious diseases
  • Diagnostic assay evaluation

Background:

  • Clostridioides difficile infection (CDI) management in children requires accurate diagnostics to avoid overtreatment.
  • Previous studies suggest PCR cycle threshold (Ct)-guided approaches can improve CDI diagnosis.
  • The QIAstat-Dx Gastroenteritis PCR Panel is a rapid diagnostic tool with potential for Ct value integration.

Purpose of the Study:

  • To evaluate the QIAstat-Dx assay performance for CDI diagnosis using Ct values.
  • To assess the impact of reporting toxin production based on Ct values on clinical management.
  • To determine if Ct-guided diagnostics reduce unnecessary antibiotic use in pediatric CDI cases.

Main Methods:

  • Prospective evaluation of the QIAstat-Dx Gastroenteritis PCR Panel in pediatric patients.
  • Correlation of PCR cycle threshold (Ct) values with free toxin presence.
  • Analysis of treatment decisions based on integrated Ct value reporting in electronic medical records.

Main Results:

  • The QIAstat-Dx assay demonstrated 100% sensitivity and 100% NPV.
  • Initial specificity was 69%, increasing to 97% after excluding co-infected samples.
  • A significant decrease in treated patients (51%) was observed compared to the pre-intervention period (68%).

Conclusions:

  • Ct-guided diagnostic strategies enhance the precision of pediatric CDI diagnosis.
  • This approach effectively reduces unnecessary antibiotic prescriptions in children.
  • The QIAstat-Dx assay, when combined with Ct values, is a valuable tool for managing pediatric CDI.

Keywords:
Clostridioides difficileCt valueinterventionpediatric

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