Differential Dye Imaging for Low-Count Blood Pathogen Detection
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Solution Overview
Problem
Current methods for detecting pathogens in bodily fluids, such as malaria parasites, face challenges in achieving high sensitivity and accuracy, particularly at low parasite counts, and require improvements in differential staining techniques to enhance detection efficiency.
Innovation Solution
A method involving the use of two dyes, one predominantly staining DNA and the other staining a different cellular component, followed by image analysis to extract spatial features of the stained areas, allowing for differential staining and accurate identification of pathogens like Plasmodium species in blood samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional staining methods are used to detect pathogens in bodily fluids, then the detection process can be performed, but the sensitivity and accuracy are insufficient particularly at low parasite counts
Solution Approach 1:
The patent divides the staining function into two separate dyes: a first dye that stains DNA and a second dye that stains a different cellular component. This segmentation allows differential staining that enhances the ability to distinguish pathogen structures from host cells, thereby improving detection sensitivity and accuracy particularly at low parasite counts.
Solution Approach 2:
The patent applies different staining characteristics to different cellular components through selective dye binding. The first dye provides DNA-specific staining while the second dye provides cytoplasmic or membrane staining, creating local quality differences that highlight pathogen features and improve measurement precision for detection.
2Measurement precision
If differential staining techniques are improved to enhance detection efficiency, then pathogen identification accuracy increases, but the complexity of the staining protocol increases
Solution Approach 1:
The patent combines two different dyes into a single staining protocol step, where both dyes are applied simultaneously or in sequence within one procedure. This merging approach achieves differential staining for improved pathogen identification accuracy while avoiding the complexity of multiple separate staining steps or additional processing requirements.
3Productivity
If automated image analysis is used to extract spatial features of stained areas, then detection speed increases, but the requirement for image processing capabilities and structural feature analysis increases system complexity
Solution Approach 1:
The patent enables the stained sample to provide its own diagnostic information through inherent structural features visible after differential staining. The spatial relationship between DNA-stained and cytoplasm-stained areas creates natural contrast patterns that automated systems can analyze without requiring additional processing steps, thereby increasing detection speed while minimizing added system complexity.
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
The method achieves diagnostic sensitivity above 95% and can detect parasites at low counts per microliter, providing rapid and accurate identification of pathogens by analyzing structural features like size and location of stained areas.
Implementation Method 1
staining said bodily sample with two or more dyes, comprising at least one dye predominantly staining DNA to thereby provide differential staining between DNA and at least one other cellular component
Implementation Method 2
at least one other dye staining at least one other cellular component being different from DNA
Implementation Method 3
identifying at least a first stained area comprising the DNA, if exists in the sample, and at least one other stained area comprising the other cellular component; extracting spatial features for the first stained area and the at least one other stained area
Data Source
AI summary
Apparatus and methods for use with a blood sample are described. The blood sample is stained with a first dye that predominantly stains DNA, and a second dye that stains at least one other cellular component being different from DNA. A plurality of images of the blood sample are acquired. A candidate object is identified as being a candidate of a given entity. A first stained area, which is stained by the first dye and which is disposed within the candidate object, is identified. A second stained area, which is stained by the second dye and which is disposed within the candidate object, is identified. The entity is detected by determining that features of the stained areas satisfy predetermined criteria associated with the entity. Other applications are also described.