Candida auris Detection via Specific PCR Primers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Candida auris is difficult to identify using standard laboratory methods, often leading to misidentification and inappropriate management, due to its multidrug resistance and similarity to other Candida species, posing a significant threat in healthcare settings.
Innovation Solution
A method for rapid detection of Candida auris using real-time polymerase chain reaction (PCR) that targets specific genes, such as the 5.8 s/ITS2 rRNA gene, with designed primers and probes to discriminate against nearest neighbors like Candida haemulonii and Saccharomyces cerevisiae, allowing for multiplex detection in a single test tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard laboratory methods are used to identify Candida species, then the identification process is simple and quick, but misidentification occurs frequently leading to inappropriate management
Solution Approach 1:
The patent segments the identification process into multiple stages: initial culture-based detection followed by confirmatory molecular testing (PCR or sequencing) for ambiguous cases. This segmentation allows simple methods to handle clear cases while complex methods resolve uncertain cases, optimizing both accuracy and resource utilization.
Solution Approach 2:
The patent introduces molecular biology techniques (PCR primers, probes, and sequencing) as intermediary tools between culture isolation and final identification. These intermediaries provide additional discriminatory power when standard morphological and biochemical methods are insufficient, particularly for distinguishing C. auris from similar species.
2Measurement precision
If molecular methods like PCR are used to accurately identify Candida auris, then identification accuracy improves, but the detection process becomes more complex and time-consuming
Solution Approach 1:
The patent performs preliminary culture and initial characterization to enrich and isolate potential C. auris colonies before applying molecular methods. This preliminary action concentrates the target organism, reducing the complexity and time of subsequent molecular testing by working with purified samples rather than complex clinical specimens.
Solution Approach 2:
The patent employs a tiered molecular approach where not all samples require full molecular characterization. Simple cases are identified through partial methods (culture morphology), while only ambiguous or high-risk cases undergo complete molecular analysis (PCR plus sequencing), reducing overall time loss while maintaining accuracy where needed.
3Reliability
If molecular detection methods are implemented for Candida auris, then misidentification is reduced, but the cost and technical requirements increase
Solution Approach 1:
The patent segments molecular detection into two tiers: a first tier using standardized PCR assays for routine detection, and a second tier using sequencing for confirmation and outbreak investigation. This segmentation allows most facilities to implement reliable detection with basic PCR while providing a pathway to higher reliability when resources permit.
Solution Approach 2:
The patent designs molecular assays with universal applicability across different Candida species. The same PCR platform and reagent systems can detect multiple Candida species including C. auris, C. haemulonii, and others, allowing laboratories to invest in a single multi-functional system rather than requiring separate specialized equipment for each species.
4Productivity
If rapid detection methods are used to identify Candida auris quickly, then infection control measures can be implemented sooner, but the sensitivity and specificity may be compromised
Solution Approach 1:
The patent performs preliminary enrichment culture steps that concentrate C. auris organisms before molecular detection. This preliminary action increases the likelihood of successful rapid detection by ensuring sufficient target DNA is present, thereby maintaining sensitivity and specificity even when using expedited molecular protocols.
Solution Approach 2:
The patent implements a partial verification approach where rapid PCR results are used for immediate infection control decisions, with full confirmatory testing performed subsequently. This allows rapid action to be taken based on highly probable results while maintaining overall accuracy through follow-up confirmation, balancing speed and precision.
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 enables accurate and rapid identification of Candida auris, reducing misidentification and facilitating timely infection control measures, even in complex samples, with improved sensitivity and specificity compared to traditional methods.
Implementation Method 1
performing an amplifying step including contacting the sample with a set of oligonucleotide primers designed to target a specific CA gene to produce an amplification product
Implementation Method 2
performing a hybridizing step including contacting the amplification product with one or more detectable oligonucleotide probes to the target CA gene
Implementation Method 3
performing a hybridizing step including contacting the amplification product with one or more detectable oligonucleotide probes to the target CA gene
Data Source
AI summary
Methods for the rapid detection of the presence or absence of Candida auris (CA) in a biological or non-biological sample are described. The methods can include performing an amplifying step, a hybridizing step, and a detecting step. Furthermore, primers, probes targeting the CA 5.8 s/ITS2 rRNA gene, along with kits are provided that are designed for the detection of CA.