Imaging Cytometry Neutralization Assay for Rapid Virus Detection
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Solution Overview
Problem
Current dengue virus neutralization assays are time-consuming and have low throughput, requiring days to detect viral infection and replication, and are cumbersome for large-scale studies due to the need for multiple plates and manual labor.
Innovation Solution
A virus reduction neutralization test (VRNT) using imaging cytometry to count virus-infected cells within 24 hours, reducing assay time and increasing throughput at least 15-fold by utilizing a 96-well format and imaging cytometry to detect infected cells one day post-infection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current standard neutralization assays (PRNT/FRNT) are used to detect viral infection, then measurement precision is achieved through plaque or foci formation, but assay time is excessively long (days to weeks) and throughput is low
Solution Approach 1:
The patent replaces the traditional mechanical/plaque-based detection system with a fluorescent imaging system. Instead of waiting for physical plaque formation and manually counting them, the system uses fluorescently labeled antibodies that bind to viral antigens, allowing detection to be performed optically with an automated imaging cytometer. This substitution of the detection mechanism enables rapid automated imaging and analysis, reducing assay time from days to hours while maintaining measurement precision through quantitative image analysis.
Solution Approach 2:
The patent implements preliminary action by pre-labeling antibodies with fluorescent markers before the assay begins. This preparation step allows the detection antibodies to be ready for immediate use, eliminating the need for post-incubation staining and processing steps that would extend assay time. The pre-prepared fluorescent antibodies can be directly applied to the cell monolayers, enabling rapid detection once the viral infection has occurred.
2Measurement precision
If manual plaque counting methods are used, then measurement precision is achieved, but device complexity and manual labor requirements increase
Solution Approach 1:
The patent replaces manual plaque counting with an automated imaging cytometer system. The device captures fluorescent images of the entire plate and uses software algorithms to automatically identify, count, and quantify infected cells based on fluorescent signal intensity and distribution. This automation eliminates manual counting errors while reducing the complexity of operational procedures, as the system handles image acquisition, processing, and analysis through integrated software.
Solution Approach 2:
The patent creates optical copies (digital images) of the entire plate contents, allowing multiple analyses of the same sample without physical manipulation. The imaging system captures a complete digital replica of each well's fluorescent patterns, which can then be processed, measured, and analyzed computationally. This copying approach enables precise quantification through image analysis algorithms while eliminating the need for physical plaque picking or manual counting procedures.
3Measurement precision
If 24-well plate format is used for FRNT testing, then one duplicate sample per plate can be accommodated, but productivity is limited and large studies require excessive numbers of plates
Solution Approach 1:
The patent transitions from using 24-well plates to 96-well plates, effectively utilizing another dimension of plate capacity. This format change allows four times more samples to be processed per plate (96 vs. 24 wells), dramatically increasing throughput for large-scale studies. The imaging cytometer system is configured to handle the higher density format, maintaining measurement precision while processing more samples in parallel across the expanded plate surface area.
Solution Approach 2:
The patent creates a universal assay platform that can handle multiple sample types and configurations within the same plate format. The imaging-based detection system is designed to accommodate various well formats (24-well, 96-well, and potentially other configurations), making the system adaptable to different study scales. This multi-functionality allows the same basic protocol and detection system to serve both small-scale precision studies and large-scale high-throughput screening needs.
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
VRNT significantly reduces assay time and increases throughput, offering rapid turnaround and automation capabilities, making it suitable for large-scale studies with improved precision and reduced manual labor.
Implementation Method 1
The VRNT utilizes imaging cytometry to count virus-infected cells
Data Source
AI summary
The instant invention describes a virus reduction neutralization test (VRNT) which is a rapid, high throughput alternative to current standard low throughput and laborious neutralization assays. The VRNT utilizes imaging cytometry to count virus-infected cells at about one day post-infection (thus eliminating the wait time other assays employ allowing for viral infection cell to cell), reducing overall assay time and increasing throughput at least 15-fold.