Microfluidic Droplet Pathogen Identification and Antimicrobial Susceptibility Testing
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Solution Overview
Problem
Current UTI diagnostic methods are slow and inefficient, relying on traditional culture-based techniques that require days to complete, leading to overuse and misuse of antibiotics, contributing to antimicrobial resistance, and lacking rapid pathogen identification and antimicrobial susceptibility testing capabilities.
Innovation Solution
A microfluidic droplet-based method that uses single-cell measurements of bacterial 16S rRNA with fluorogenic peptide nucleic acid probes for hybridization detection, enabling rapid pathogen identification and antimicrobial susceptibility testing directly from urine samples without nucleic acid amplification, allowing for simultaneous molecular detection and phenotypic assessment within 30 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional culture-based methods are used for pathogen ID and AST, then diagnostic accuracy is maintained, but diagnostic time is excessively long (several days)
Solution Approach 1:
The diagnostic process is segmented into distinct functional modules: nucleic acid extraction, PCR amplification with pathogen-specific primers, and parallel AST reactions with antibiotic-treated droplets. Each module operates independently and can be optimized separately, enabling rapid sequential processing that reduces total diagnostic time while maintaining accuracy through targeted detection at each stage
Solution Approach 2:
Antibiotics are pre-added to individual droplets before bacterial inoculation, creating pre-prepared AST reaction environments. This preliminary action eliminates the need for separate AST setup after pathogen identification, allowing simultaneous pathogen ID and AST completion within the same rapid timeframe without compromising either diagnostic accuracy
2Productivity
If traditional culture-based methods are used, then comprehensive pathogen identification is achieved, but sample preparation is labor-intensive and time-consuming
Solution Approach 1:
The system uses automated liquid handling and robotic pipetting to perform sample processing, nucleic acid extraction, and droplet generation without manual intervention. The microfluidic device automatically partitions samples into individual droplets, adds reagents, and maintains reactions, eliminating labor-intensive manual sample preparation while maintaining comprehensive pathogen identification capabilities
Solution Approach 2:
Manual mechanical sample preparation steps are replaced with automated fluidic systems and microfluidic technologies. The system uses automated nucleic acid extraction protocols and robotic droplet manipulation to substitute human-operated mechanical processes, dramatically improving sample processing efficiency while reducing preparation complexity through automation
3Speed
If empiric broad-spectrum antibiotic treatment is used, then immediate treatment is provided, but antimicrobial resistance increases
Solution Approach 1:
The system provides rapid feedback through real-time PCR detection and immediate AST results, enabling clinicians to adjust treatment based on actual pathogen susceptibility data within hours rather than days. This feedback loop allows transition from empiric broad-spectrum treatment to targeted narrow-spectrum antibiotic therapy, reducing antimicrobial resistance pressure while maintaining rapid treatment initiation
Solution Approach 2:
The diagnostic system enables dynamic treatment adjustment by providing time-resolved pathogen identification and susceptibility data. Treatment protocols can be dynamically modified based on emerging diagnostic information, allowing initial broad-spectrum coverage to be rapidly narrowed to susceptibility-guided therapy, thereby reducing resistance development while maintaining treatment speed
4Loss of time
If rapid diagnostic platforms are developed, then diagnostic time is reduced, but pathogen classification capability and AST coverage are limited
Solution Approach 1:
The platform integrates multiple diagnostic functions into a single system: pathogen detection through PCR, pathogen classification through sequence analysis, and antimicrobial susceptibility testing through parallel droplet reactions. This multi-functional integration enables comprehensive pathogen identification and AST coverage within rapid timeframes by performing multiple assays simultaneously in the same automated workflow
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces diagnostic time, eliminates the need for labor-intensive sample preparation, and provides accurate identification and susceptibility testing, effectively addressing antimicrobial resistance by enabling evidence-based treatment decisions.
Implementation Method 1
a set of probes comprising a plurality of probes, each probe comprising a peptide nucleic acid (PNA) sequence that is complementary to a 16S rRNA sequence of the bacterial cell
Implementation Method 2
each probe comprising at least one nucleobase sequence that is at least partially complementary to at least one region of at least one 16S ribosomal RNA (rRNA) sequence
Implementation Method 3
each probe comprising at least one reporter moiety and at least one quencher moiety that substantially quenches the reporter moiety at least when the plurality of probes are not hybridized to the 16S rRNA
Implementation Method 4
bacterial cells in the droplets to multiply and/or to at least produce additional 16S rRNA if the bacterial cells are not susceptible to the antimicrobial agent
Data Source
AI summary
Provided herein are methods of identifying and determining the antimicrobial susceptibility of bacteria in samples. Related devices, systems, reaction mixtures, kits, and other methods are also provided.