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Direct Urine Resistance Detection Using VITEK 2.

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Summary
This summary is machine-generated.

This study presents a faster method for diagnosing urinary tract infections (UTIs) by directly analyzing urine samples. The new approach combines flow cytometry, MALDI-TOF MS, and VITEK 2 for rapid antimicrobial susceptibility testing (AST).

Keywords:
Escherichia coliMALDI-TOF MScarbapenemasesresistanceurinary tract infections

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Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Diagnostic Technology

Background:

  • Urinary tract infections (UTIs) are common, with increasing antibiotic resistance necessitating alternative management strategies.
  • Current diagnostic methods for UTIs can be time-consuming, delaying appropriate antibiotic treatment.
  • Rapid identification and antimicrobial susceptibility testing (AST) are crucial for effective UTI management and combating resistance.

Purpose of the Study:

  • To shorten the diagnostic time for UTIs by developing a direct analysis method for urine samples.
  • To evaluate a combined approach using flow cytometry, MALDI-TOF MS, and VITEK 2 for rapid UTI diagnosis and AST.

Main Methods:

  • Urine samples were screened for bacteria using flow cytometry (UF5000), with a cut-off set at 150 bacteria/mL.
  • Pathogen identification was confirmed using matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF MS).
  • Direct antimicrobial susceptibility testing (AST) was performed on Escherichia coli isolates using the VITEK 2 system with an N388 card.

Main Results:

  • A total of 211 E. coli isolates from urine samples were tested.
  • The direct AST method showed a total categorical agreement (CA) of 97.4% compared to standard methods.
  • This novel diagnostic approach reduced the overall diagnosis time by one day without significant loss of sensitivity.

Conclusions:

  • The combined method of flow cytometry, MALDI-TOF MS, and direct VITEK 2 AST offers a faster and realistic approach to diagnosing UTIs.
  • This expedited diagnostic strategy is well-suited for guiding antibiotic therapy based on achievable drug concentrations.
  • The study supports the exploration of rapid, direct urine analysis for improved management of urinary tract infections.