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Automated Microbial Diagnostics01:24

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Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...

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Direct Testing for KPC-Mediated Carbapenem Resistance from Blood Samples Using a T2 Magnetic Resonance Based Assay.

Giulia De Angelis1,2, Riccardo Paggi3, Thomas J Lowery4

  • 1Dipartimento di Scienze Biotecnologiche di Base, Cliniche Intensivologiche e Perioperatorie, Università Cattolica del Sacro Cuore, 00168 Roma, Italy.

Antibiotics (Basel, Switzerland)
|August 27, 2021
PubMed
Summary

The T2Resistance™ panel accurately detects carbapenem resistance genes directly from blood, aiding in the diagnosis of Gram-negative bacterial bloodstream infections (BSIs). This molecular test offers a faster alternative to traditional blood cultures for identifying resistant pathogens.

Keywords:
KPC carbapenemaseT2Resistance panelantimicrobial resistanceblood samplebloodstream infectiondirect detectionmagnetic resonance

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Area of Science:

  • Clinical microbiology
  • Molecular diagnostics
  • Infectious diseases

Background:

  • Molecular testing for carbapenem resistance in Gram-negative bacterial bloodstream infections (BSIs) is limited by reliance on positive blood cultures.
  • Rapid detection of carbapenemase and other β-lactamase genes is crucial for effective patient management.

Purpose of the Study:

  • To evaluate the T2Resistance™ panel for direct detection of carbapenem resistance genes in blood samples from patients with BSIs.
  • To assess the utility of molecular testing for guiding antimicrobial therapy.

Main Methods:

  • The T2Resistance™ panel was used to analyze 13 blood samples from patients with BC-documented BSIs.
  • Carbapenem resistance genes were identified directly from blood specimens.

Main Results:

  • Carbapenem resistance genes were detected in 11 out of 13 samples (84.6%).
  • Detected pathogens included KPC-producing *Klebsiella pneumoniae* and VIM/CMY-producing *Citrobacter freundii*.
  • Two negative samples were from patients receiving effective antibiotic therapy for KPC-producing *K. pneumoniae* BSIs.

Conclusions:

  • The T2Resistance™ panel demonstrates reliability in diagnosing carbapenem-resistant Gram-negative bacterial BSIs.
  • Direct molecular testing from blood shows promise for rapid identification of resistance mechanisms.
  • This technology may improve timely treatment decisions for patients with BSIs.