Labeled Bacteriophage Detection for Rapid Pathogen Identification
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Solution Overview
Problem
Current methods for detecting bacterial pathogens are time-consuming, costly, and prone to contamination, leading to incorrect antibiotic therapies and economic losses, especially in clinical and food safety contexts, where rapid and specific identification is crucial.
Innovation Solution
A method utilizing labeled bacteriophages that specifically bind to bacterial species, allowing for filtration and detection of bacteria-bacteriophage complexes, enabling rapid and sensitive identification without the need for blood culture incubation, and using a reaction vessel with a filter to separate bound and unbound phages for accurate results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional blood culture methods are used, then bacterial pathogens can be detected with high reliability, but the detection time is too long (48-72 hours routine incubation, up to 5-21 days for slow-growing bacteria)
Solution Approach 1:
The patent applies preliminary action by pre-labeling bacteriophages with fluorescent markers before they encounter the bacteria. This preparation in advance allows for immediate detection upon binding, eliminating the need for lengthy incubation periods while maintaining detection reliability. The labeled phages are ready to bind and be detected within minutes to hours rather than days.
Solution Approach 2:
The patent uses bacteriophages as intermediaries to detect bacteria. Instead of directly detecting bacteria through traditional culture methods, the system employs phages that specifically bind to bacterial surfaces as a mediator. This intermediary approach enables rapid detection by measuring phage binding rather than waiting for bacterial growth, reducing detection time from days to hours while maintaining specificity.
2Loss of time
If PCR diagnostic methods are used for rapid detection, then detection time is reduced to 4-6 hours, but the method is susceptible to contamination causing false results and requires specialized infrastructure and personnel
Solution Approach 1:
The patent uses bacteriophages as a biological intermediary that naturally targets bacteria through specific surface binding. This biological specificity provides inherent resistance to contamination, as the labeled phages will only bind to their specific bacterial targets and not to contaminants or other substances, eliminating the false positive/negative problems associated with PCR contamination.
Solution Approach 2:
The patent employs fluorescent labeling of bacteriophages, where the label emits light at a specific wavelength upon excitation. This optical signal provides a clear, controllable detection method that is not susceptible to contamination in the same way PCR is. The fluorescent signal can be easily distinguished from background noise and contaminants, improving reliability while maintaining rapid detection.
3Loss of time
If PCR diagnostic methods are used, then detection can be performed without blood culture incubation, but the infrastructure requirements and operational complexity increase significantly
Solution Approach 1:
By using bacteriophages as intermediaries that can be simply mixed with the sample and allowed to bind, the patent eliminates the need for complex PCR infrastructure such as thermal cyclers, specialized reagents, and sophisticated detection equipment. The binding reaction can occur in simple containers under ambient conditions, dramatically reducing device complexity and infrastructure requirements.
Solution Approach 2:
The patent replaces the complex mechanical and thermal systems required for PCR (thermal cyclers, precise temperature control, complex fluid handling) with a simple biological binding reaction that can occur at ambient temperature in static or gently mixed conditions. This substitution of complex mechanical systems with a simple biological interaction reduces infrastructure requirements while maintaining rapid detection capability.
4Productivity
If broad-spectrum antibiotics are used empirically, then immediate treatment can be initiated, but this leads to selection of multi-resistant bacterial strains and unnecessary costs
Solution Approach 1:
The patent uses bacteriophages as specific intermediaries that target only the bacterial species present in the sample. By identifying the specific pathogen through phage binding, the system enables targeted antibiotic selection rather than empirical broad-spectrum treatment. This specificity prevents the selection of multi-resistant strains by ensuring antibiotics are used only when and against which they are truly needed.
Solution Approach 2:
The patent changes the parameter of treatment specificity from broad-spectrum to pathogen-specific by using phage binding characteristics. The specific affinity of different phages for different bacterial species provides a basis for identifying the exact pathogen, which then guides the selection of the most appropriate narrow-spectrum antibiotic, avoiding unnecessary broad-spectrum use and resistance selection.
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 method allows for the rapid detection of bacterial pathogens directly from samples in under an hour, reducing the need for extensive infrastructure and specialized personnel, while minimizing contamination risks and enabling precise antibiotic application, thus improving patient outcomes and food safety.
Implementation Method 1
bacteriophages (phages for short) offer a promising starting point. Bacteriophages are viruses that only specifically target bacterial cells, recognize them via surface receptor structures, bind to them like a lock and key
Implementation Method 2
C) filtration of the resulting reaction mixture using a filter having a pore size of 0.1 μm to 0.5 μm; D) detection of bacteria-bacteriophage complexes in the retentate
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The invention relates to a fast, simple, and highly sensitive method for detecting bacteria, comprising the following steps: providing one or more suspensions, each comprising at least one species of labeled test bacteriophages, which specifically bind to a bacterial species to be detected; adding a sample, which should be tested for the presence of at least one bacterial species to be detected, to the one or more suspensions; filtering the reaction mixture; detecting bacterium-bacteriophage complexes on the filter surface in the retentate if at least one bacterial species to be detected is present, wherein the complexes consist of bacteria of the at least one bacterial species to be detected and test bacteriophages of the at least one species of test bacteriophages bound thereto; detecting unbound test bacteriophages in the filtrate; processing obtained detection signals in a processor-aided manner and outputting detection results. The invention further relates to a reaction vessel and to a measuring apparatus for the method.