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Related Concept Videos

Candidiasis01:20

Candidiasis

Candidiasis is a fungal infection caused by opportunistic species of Candida. It can affect various anatomical sites, including the skin, oral cavity, nails, and genitourinary tract. Among its forms, vaginal candidiasis is the most common type of mucosal infection. It typically results from the overgrowth of Candida albicans in the vaginal mucosa. Under normal conditions, C. albicans exists as a commensal organism within the vaginal microbiota, regulated by the dominance of lactobacilli, which...

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Catheter-Associated Candiduria: Aggregates, Microscopy, and CFU Variability.

Stephan Steixner1, Angelika Bauer2, Rosa Bellmann-Weiler3

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|March 10, 2026
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Summary
This summary is machine-generated.

Standardized quantitative culture for catheter-associated candiduria improves detection but reveals variability. Visible urine aggregates do not reliably predict Candida presence, highlighting the need for improved diagnostic consistency.

Keywords:
AggregatesCandiduriaColony forming unitsDiagnostic variabilityQuality improvementUrinary tract catheter

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Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Quality Improvement in Healthcare

Background:

  • Diagnosis of catheter-associated candiduria is challenging due to lack of standardized colony-forming unit (CFU) thresholds and variable laboratory methods.
  • Current semi-quantitative culture (SQM) methods may lead to inconsistent patient management.

Purpose of the Study:

  • To implement and evaluate a standardized quantitative culture (QM) workflow for catheter urine.
  • To compare QM with routine SQM for CFU detection and reproducibility.
  • To assess the predictive value of visible urine aggregates for Candida species presence.

Main Methods:

  • A quality improvement initiative involving 222 yeast-positive urine samples from 74 catheterized patients over one year.
  • Parallel testing using standardized quantitative culture (QM) and semi-quantitative culture (SQM).
  • Microscopy of urine aggregates and species identification using CHROMID® Candida agar and MALDI-TOF.

Main Results:

  • Quantitative culture (QM) showed poor agreement with semi-quantitative culture (SQM) (κ=0.17), detecting growth in samples reported as sterile by SQM.
  • Visible urine aggregates were present in 13.1% of samples, but only 44.8% contained Candida, with no reliable distinguishing features.
  • While cohort median QM counts were stable, significant intra-patient variability (>10^3 CFU/mL) was observed in 6.8% of patients, suggesting pre-analytical issues.

Conclusions:

  • A standardized QM workflow reveals significant discordance with SQM and highlights pre-analytical variability in catheter urine cultures.
  • Visible urine aggregates are unreliable indicators for Candida species presence.
  • Adoption of standardized QM, systematic microscopy, and improved lab-clinician communication is recommended to enhance diagnostic consistency for candiduria.