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Related Concept Videos

Automated Microbial Diagnostics01:24

Automated Microbial Diagnostics

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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Stress-induced Antibiotic Susceptibility Testing on a Chip
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A multiplexed nanoliter array-based microfluidic platform for quick, automatic antimicrobial susceptibility testing.

Mohammad Osaid1, Yi-Sin Chen1, Chih-Hung Wang1

  • 1Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan. gwobin@pme.nthu.edu.tw.

Lab on a Chip
|April 23, 2021
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Summary
This summary is machine-generated.

This study presents a novel microfluidic platform for rapid antimicrobial susceptibility testing (AST). The system significantly reduces testing time to 8-9 hours, aiding in faster diagnosis and treatment of bacterial infections.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Antimicrobial Resistance

Background:

  • Antimicrobial resistance (AMR) is a growing global health crisis due to antibiotic overuse.
  • Ineffective antibiotics and excessive consumption exacerbate the AMR problem.
  • Rapid antimicrobial susceptibility testing (AST) is crucial for combating bacterial infections effectively.

Purpose of the Study:

  • To develop a simple, nanoliter array-based microfluidic platform for rapid AST.
  • To enable precise liquid handling in nanoliter and microliter volumes for AST.
  • To create a user-friendly and easily fabricated device for clinical applications.

Main Methods:

  • Integration of two microfluidic devices: one for AST and one for antibiotic dilution.
  • A single-layered microfluidic chip without active microvalves or air holes for simplified fabrication and use.
  • Utilizing porous polydimethylsiloxane membranes for uniform bacterial distribution via air displacement.
  • A multiplexed dilution chip capable of testing seven antibiotic concentrations to determine minimum inhibitory concentrations (MICs).

Main Results:

  • The automated system successfully performed AST and determined MICs for Escherichia coli using ampicillin and streptomycin.
  • MIC determination required a minimal bacterial count (∼2000), shortening pre-culture steps.
  • Results were validated against a gold standard method, confirming accuracy.
  • The entire AST process was completed in a significantly reduced time of 8-9 hours.

Conclusions:

  • The developed microfluidic platform offers a rapid and efficient method for AST.
  • This technology has high clinical utility for timely diagnosis and treatment of bacterial infections.
  • The simplified design and automated process make it suitable for widespread adoption in healthcare settings.