Abstract
Expeditious and accurate determination of pathogenic bacteria cell viability is of great importance to public health for numerous areas including medical diagnostics, food safety, and environmental monitoring. In this work a cell buoyant mass classifier approach is presented to assess bacteria cell viability in real time. Buoyant mass measurements for live and dead Gram-positive and Gram-negative bacteria populations were acquired with a commercial suspended microchannel resonator, Archimedes, to generate receiver operating characteristic (ROC) curves. To quantitatively assess the difference in buoyant mass for live and dead bacteria populations, ROC curves were generated to demonstrate cell viability determination. The results are presented as a binary classifier with a decision boundary, above which cells are considered live and below which cells are considered dead. A decision threshold value is evaluated with consideration that a certain true positive rate (correct classification of a live cell) is maintained with an acceptable false positive rate. The potential for this approach to monitor cell viability in real time is significant, especially when considering multiple classifier dimensions such as buoyant mass and density. This classifier approach represents a next generation technique for rapid and label-free diagnostics based on cell feature measurements.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Code Availability
The code generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
This research was supported by In-House Laboratory Independent Research (ILIR) Program at U.S. Army Combat Capabilities and Development Command Soldier Center. Christina L. Lewis was supported by the National Research Council Research Associateship Program for this work. No funding or resources from MIT Lincoln Laboratory were used to produce the results and findings reported in this publication.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by CLL, BML, and AGS. The first draft of the manuscript was written by CLL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Lewis, C.L., Senecal, A.G., Wiederoder, M.S. et al. Differentiating Live Versus Dead Gram-Positive and Gram-Negative Bacteria With and Without Oxidative Stress Using Buoyant Mass Measurements. Curr Microbiol 79, 74 (2022). https://doi.org/10.1007/s00284-022-02764-1
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DOI: https://doi.org/10.1007/s00284-022-02764-1