Carbapenemase Test Compositions for Ambler Class Differentiation
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Solution Overview
Problem
Current methods lack accurate detection and differentiation of Ambler class carbapenemases expressed by enteric bacteria, which are critical for determining antimicrobial therapy and infection control measures, as existing antibiotics do not cover all carbapenemase enzyme types.
Innovation Solution
A method involving application of enteric bacteria in multiple test compositions containing specific concentrations of antibiotics and carbapenemase inhibitors to detect the presence or inhibition of growth, allowing identification of Ambler class carbapenemases by detecting growth patterns in these compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple test compositions with different antibiotic and inhibitor combinations are used, then measurement precision of carbapenemase class identification is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into multiple discrete test compositions (at least five), each containing specific combinations of antibiotics and carbapenemase inhibitors. This segmentation allows systematic differentiation of Ambler classes A, B, C, and D carbapenemases through distinct growth inhibition patterns in each composition, resolving the contradiction by organizing complexity into manageable, purposeful segments.
Solution Approach 2:
Each test composition is designed with local quality - specific antibiotics (e.g., MEM, TEM, DOR) paired with specific carbapenemase inhibitors (e.g., avibactam, vaborbactam, relebactam, EDTA) at defined concentrations. This localized differentiation strategy enables precise identification of carbapenemase classes by observing which specific compositions inhibit bacterial growth, balancing precision requirements with systematic test design.
2Measurement precision
If multiple test compositions with specific antibiotic and inhibitor combinations are used, then measurement precision of carbapenemase detection is improved, but loss of time increases
Solution Approach 1:
The test compositions are prepared in advance with pre-determined combinations of antibiotics and carbapenemase inhibitors at optimized concentrations. This preliminary preparation eliminates the need for complex real-time adjustments during testing, allowing rapid incubation and reading of results across all compositions simultaneously, thus improving precision without proportionally increasing detection time.
3Reliability
If at least five test compositions with different antibiotic and inhibitor combinations are used, then reliability of carbapenemase class differentiation is improved, but device complexity increases
Solution Approach 1:
The panel of at least five test compositions serves multiple functions simultaneously: it detects carbapenemase presence, differentiates Ambler classes (A, B, C, D), and provides information for antimicrobial therapy selection. This multi-functionality approach improves reliability by making the same testing system capable of multiple diagnostic tasks, offsetting the perceived complexity through consolidated utility.
Solution Approach 2:
Carbapenemase inhibitors act as intermediaries between the antibiotic and the carbapenemase enzyme. By introducing these inhibitor molecules into specific test compositions, the system mediates the interaction between antibiotic and enzyme, allowing indirect detection and classification of carbapenemase types through observed growth inhibition patterns, thereby improving reliability without requiring direct enzyme measurement.
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
Enables precise identification of Ambler class carbapenemases, facilitating effective antimicrobial therapy and infection control by distinguishing between different classes of carbapenemases.
Implementation Method 1
detecting a presence or an inhibition of growth of the enteric bacteria in each of the at least five test compositions
Data Source
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AI summary
Provided herein are compositions, methods, systems and/or kits for detection of bacteria expressing enzymes that confer resistance to antimicrobial agents. Certain embodiments of the compositions, methods, systems and/or kits of the present disclosure are related to detection of carbapenemase-producing gram negative bacteria. Certain embodiments of the compositions, methods, systems and/or kits of the present disclosure are related to detection of Ambler Class A, B and/or D carbapenemase-producing enteric and non-fermenting gram negative rod bacteria.