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Related Concept Videos

Methods of Classification and Identification01:28

Methods of Classification and Identification

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Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
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Visualization of Bacterial Resistance using Fluorescent Antibiotic Probes
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A rapid bacterial labeling method for phenotypic antimicrobial susceptibility testing.

Joseph D Kittle1, Joel S Lwande1, Monika M Jangir2

  • 1CytoSPAR, 500 Carteret Street, Suite D, Beaufort, SC 29902 USA.

Diagnostic Microbiology and Infectious Disease
|November 8, 2025
PubMed
Summary

A new Bacteria Labeling Antibiotic Susceptibility Test (BLAST) provides results in 6 hours, overcoming slow traditional methods. This rapid antimicrobial susceptibility test (AST) aids in faster treatment decisions for bacterial infections.

Keywords:
AntimicrobialClick-chemistryDiagnosticE. coliFluorescenceSusceptibilityUrine

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Area of Science:

  • Clinical microbiology
  • Diagnostic innovation
  • Drug resistance research

Background:

  • Bacterial infections present diagnostic and treatment challenges due to rising multidrug-resistant pathogens.
  • Current Antimicrobial Susceptibility Tests (AST) require lengthy bacterial isolation, delaying patient care and antibiotic stewardship.
  • Faster AST results are crucial for improved patient outcomes, effective antibiotic use, and cost reduction.

Purpose of the Study:

  • To evaluate a novel, rapid diagnostic method called Bacteria Labeling Antibiotic Susceptibility Test (BLAST).
  • To assess BLAST's performance in determining antibiotic susceptibility for common urinary tract infection pathogens.
  • To compare BLAST results with established reference methods for accuracy and speed.

Main Methods:

  • BLAST utilizes metabolic labeling and click-chemistry to detect newly synthesized bacterial proteins.
  • Antibiotic inhibition of protein biosynthesis is measured using a fluorescent reader in a 96-well format.
  • The method was tested on various bacterial growth conditions, including bacteria-contrived urine samples, across a range of inocula.

Main Results:

  • BLAST successfully determined Minimum Inhibitory Concentration (MIC) values for Gram-positive and Gram-negative pathogens against eleven antibiotics within 6 hours.
  • MIC values obtained via BLAST aligned with those from the reference broth microdilution (rBMD) method and CLSI quality control ranges.
  • The method demonstrated agreement with rBMD results when tested on bacteria-contrived urine cultures.

Conclusions:

  • The Bacteria Labeling Antibiotic Susceptibility Test (BLAST) offers a rapid and scalable solution for AST.
  • This innovative approach can significantly reduce the time to results for bacterial susceptibility testing.
  • BLAST has the potential to improve patient management and antibiotic stewardship in clinical settings.