Dip-Slide Absorbent Medium for Rapid Legionella Detection
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Solution Overview
Problem
Current methods for detecting Legionella bacteria, such as the Standard Method, require 10 days for incubation and quantification, leading to delayed identification and significant economic losses due to facility shutdowns, and lack the ability to differentiate between viable and non-viable cells in environmental samples.
Innovation Solution
The use of dip-slides with an absorbent medium and detection reagents allows for the rapid detection and quantification of viable Legionella bacteria within hours to days, enabling early intervention and minimizing contamination, using methods like polymerase chain reaction assays, differential fluorescent antibody assays, and fluorescence in situ hybridization, which can be performed in the field or laboratory without specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Standard Method is used for Legionella detection, then reliable quantification of viable bacteria is achieved, but the detection time is extended to 10 days causing facility shutdowns and economic losses
Solution Approach 1:
The patent applies preliminary action by pre-coating dip-slide surfaces with selective growth media containing antibiotics and nutrients specific to Legionella. This preparation is done in advance, allowing immediate sampling and incubation without delay. The pre-prepared selective environment enables rapid isolation and detection of viable Legionella within hours rather than days, resolving the contradiction between reliability and detection time.
2Measurement precision
If the Standard Method is used, then accurate viable cell counts are obtained, but facility operations must be halted resulting in substantial economic losses
Solution Approach 1:
The patent replaces the traditional mechanical incubation system requiring 10 days with a rapid detection system using dip-slides combined with molecular detection methods or enhanced cultural techniques. This substitution reduces detection time from 10 days to hours while maintaining measurement precision through selective media and targeted detection, allowing facilities to remain operational and avoiding economic losses.
3Loss of time
If rapid detection methods are used, then detection time is reduced, but the ability to differentiate viable from non-viable cells is lost
Solution Approach 1:
The patent applies local quality by incorporating specific selective agents and nutrients in different zones or layers of the dip-slide medium. The selective antibiotics and growth factors are locally concentrated to create an environment that only supports viable Legionella growth, while molecular probes or staining techniques provide local detection capability. This localized approach enables rapid differentiation of viable from non-viable cells within hours.
4Reliability
If traditional culture methods are used, then comprehensive Legionella detection is achieved, but the process requires 10 days of incubation
Solution Approach 1:
The patent changes key parameters of the culture system by using enriched selective media with optimized nutrient compositions, elevated CO2 environments, and controlled temperature incubation. These parameter changes accelerate Legionella growth rate while maintaining detection comprehensiveness. The modified parameters enable viable cell detection within hours rather than 10 days, resolving the contradiction between reliability and incubation duration.
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 early detection and quantification of Legionella, reducing economic losses and allowing for faster decontamination procedures, while providing safe and reliable results equivalent to the Standard Method, with the added benefit of simultaneous determination of total heterotrophic aerobic bacterial counts.
Implementation Method 1
providing a dip-slide comprising an absorbent medium, wherein the absorbent medium includes nutrients for culturing Legionella
Implementation Method 2
the absorbent medium includes nutrients for culturing Legionella
Implementation Method 3
detecting growth of Legionella bacteria on the dip-slide with a detection reagent
Implementation Method 4
differential fluorescent antibody assays, and fluorescence in situ hybridization
Data Source
AI summary
Methods and compositions detect and quantify viable Legionella and other heterotrophic aerobic bacteria. Dip-slides that include an absorbent medium, growth promoting, and growth selective substances are useful in rapid detection and quantification of microcolonies of Legionella. Most probable number method of detection and quantification of Legionella are disclosed.