4.1 Article

A Multiplex Electrochemical Biosensor for Bloodstream Infection Diagnosis

Journal

SLAS TECHNOLOGY
Volume 22, Issue 4, Pages 466-474

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1177/2211068216651232

Keywords

infection; biosensor; blood; diagnostics; RNA

Funding

  1. NIH [R01AI117059, R44HD084033]
  2. NSFC [21375068]

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Accurate and timely detection of bacterial pathogens will improve the clinical management of infections. Herein, we demonstrate an electrochemical biosensor that directly detects bacteria in human blood samples, resulting in the rapid diagnosis of a bloodstream infection. The multiplex biosensor detects the species-specific sequences of the 16S ribosomal RNA of bacteria for pathogen identification in physiological samples without preamplification. The analytical performance characteristics of the biosensor, including the limit of detection and probe cross-reactivity, are evaluated systematically. The feasibility of the biosensor for a diagnosis of a bloodstream infection is demonstrated by identifying bacterial clinical isolates spiked in whole blood and blood culture samples that were tested positive for bacteria. The electrochemical biosensor correctly identifies all the species in the samples with 100% concordance to microbiological analysis.

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