Integrating omics techniques and culture-independent systems may improve the detection of persistent candidemia: data from an observational study

Ann Clin Microbiol Antimicrob. 2024 Aug 22;23(1):75. doi: 10.1186/s12941-024-00736-w.

Abstract

Introduction: Blood cultures have low sensitivity for candidemia. Sensitivity can be improved by the culture-independent system T2 Magnetic Resonance (T2). SeptiCyte RAPID is a host response assay quantifying the risk of infection-related inflammation through a scoring system (SeptiScore). We investigate the performance of SeptiScore in detecting persistent candidemia as defined by conventional cultures and T2.

Methods: This is a prospective multicentre observational study on patients with candidemia. Blood cultures and blood samples for assessment by T2 and SeptiCyte were collected for 4 consecutive days after the index culture. The performance of SeptiScore was explored to predict persistent candidemia as defined by (1) positive follow-up blood culture (2) either positive follow-up blood culture or T2 sample.

Results: 10 patients were enrolled including 34 blood collections assessed with the 3 methods. Overall, 4/34 (12%) follow-up blood cultures and 6/34 (18%) T2 samples were positive. A mixed model showed significantly higher SeptiScores associated with persistent candidemia when this was defined as either a positive follow-up blood culture or T2 sample (0.82, 95%CI 0.06 to 1.58) but not when this was defined as a positive follow-up blood culture only (-0.57, 95%CI -1.28 to 0.14). ROC curve for detection of persistent candidemia by SeptiScore at day 1 follow-up showed an AUC of 0.85 (95%CI 0.52-1.00) when candidemia was defined by positive follow-up blood culture, and an AUC of 1.00 (95%CI 1.00-1.00) when candidemia was defined according to both methods.

Conclusion: Integrating transcriptome profiling with culture-independent systems and conventional cultures may increase our ability to diagnose persistent candidemia.

Keywords: Blood culture; Candidemia; Host-response; Omics; Rapid diagnostic tests; T2 magnetic resonance.

Publication types

  • Observational Study
  • Multicenter Study

MeSH terms

  • Aged
  • Aged, 80 and over
  • Blood Culture* / methods
  • Candida / genetics
  • Candida / isolation & purification
  • Candidemia* / blood
  • Candidemia* / diagnosis
  • Candidemia* / microbiology
  • Female
  • Humans
  • Male
  • Middle Aged
  • Prospective Studies
  • ROC Curve
  • Sensitivity and Specificity