Flow Cytometry Antimicrobial Susceptibility Detection
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Solution Overview
Problem
Current laboratory methods for detecting antimicrobial resistance in microorganisms are slow, labor-intensive, and often require pure cultures, which can take 24-72 hours, leading to delayed therapy and increased antimicrobial resistance, especially in critical infections like septic shock.
Innovation Solution
A method using flow cytometry to directly assess antimicrobial susceptibility from uncultured biological samples like urine or blood by comparing fluorescence parameters between samples with and without therapeutic agents, allowing for rapid detection of resistant microorganisms and their resistance mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If culture-based diagnostic methods are used, then phenotypic identification and antimicrobial susceptibility testing are provided, but the detection time is extended to 48-72 hours
Solution Approach 1:
The patent replaces the mechanical culture-based detection system with a flow cytometry-based optical detection system. Instead of waiting for microbial growth on culture media, the invention uses fluorescent markers and flow cytometry to directly detect and characterize microorganisms in liquid samples, enabling susceptibility evaluation within hours rather than days.
Solution Approach 2:
The invention changes the detection parameters from visual colony formation and growth measurements to fluorescence intensity measurements. By using fluorescent markers that bind to specific cellular components or indicate metabolic activity, the system transforms the detection parameter from macroscopic growth patterns to microscopic fluorescence signals that can be rapidly quantified by flow cytometry.
2Reliability
If pure culture methods are used, then identification and susceptibility evaluation can take place, but the process requires 24 hours minimum for microbial growth
Solution Approach 1:
The invention extracts the essential identification and susceptibility characteristics from the culture process itself. Instead of requiring complete microbial growth to obtain these characteristics, the flow cytometry method extracts fluorescent signals that directly indicate species-specific features and drug susceptibility, eliminating the need for prolonged culture while maintaining identification reliability.
Solution Approach 2:
The method performs preliminary characterization of microorganisms before complete culture development. By using fluorescent markers that bind to cell wall components, nucleic acids, or metabolic enzymes present in viable cells, the system obtains identification and susceptibility data from intact cells without requiring them to form visible colonies first.
3Loss of time
If large spectrum antibiotics are used for empiric therapy, then appropriate therapy can be initiated quickly, but antimicrobial resistance increases
Solution Approach 1:
The invention implements a rapid feedback loop that provides susceptibility results within hours, enabling clinicians to adjust therapy from empiric broad-spectrum antibiotics to targeted narrow-spectrum agents. This quick feedback mechanism allows for de-escalation of antibiotic therapy, reducing selective pressure for resistance development while maintaining effective treatment.
4Measurement precision
If biochemical protocols are used for susceptibility testing, then susceptibility to specific drugs can be determined, but the protocols are inactive for many drugs and require pure cultures
Solution Approach 1:
The patent creates a universal susceptibility testing platform using flow cytometry that can evaluate antimicrobial activity across multiple drug classes and mechanisms of action. Instead of requiring separate biochemical protocols for each drug type, the single flow cytometry method with appropriate fluorescent markers can detect susceptibility to cell wall active drugs, protein synthesis inhibitors, nucleic acid drugs, and other antimicrobial classes, eliminating the need for drug-specific protocols.
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
Enables rapid determination of antimicrobial susceptibility and resistance mechanisms within hours, reducing the time to appropriate therapy and minimizing the development of antimicrobial resistance, while also allowing for the evaluation of drug effectiveness and resistance mechanisms directly from clinical samples.
Implementation Method 1
add to both tubes a fluorescent marker; perform a fluorescence analysis for obtaining one or more fluorescence or growth parameters
Data Source
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AI summary
The present invention relates to a method for detecting resistant microorganisms to a therapeutic agent in a biological sample, comprising the following steps: a. inoculate the said sample, uncultured, on a first tube with, and on a second tube without, at least one therapeutic agent; preferentially further including at least one lysing agent and/or a buffer, and/or a suitable culture medium, or put the sample on a separation serum tube; and incubated it; b. add to both tubes a fluorescent marker; c. perform a fluorescence analysis for obtaining one or more fluorescence or growth parameters for each of the two tubes; wherein the microorganisms resistant phenotype of the biological sample to said therapeutic agent is obtained by comparing the one or more fluorescence parameters between the two tubes. Therefore, the present invention is useful in laboratory procedures or routines for the detection of the susceptibility of different microorganisms to a therapeutic agent, to the determination of microorganisms resistance mechanisms or even to evaluate the amount of antimicrobial drug in the biological sample.