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A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS

BACKGROUND: The application of matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry (MS) to microbial identification has allowed the development of rapid methods for identification of microorganisms directly in positive, blood cultures (BCs). These methods can yie...

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Autores principales: Florio, Walter, Cappellini, Susanna, Giordano, Cesira, Vecchione, Alessandra, Ghelardi, Emilia, Lupetti, Antonella
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6884914/
https://www.ncbi.nlm.nih.gov/pubmed/31783786
http://dx.doi.org/10.1186/s12866-019-1641-1
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author Florio, Walter
Cappellini, Susanna
Giordano, Cesira
Vecchione, Alessandra
Ghelardi, Emilia
Lupetti, Antonella
author_facet Florio, Walter
Cappellini, Susanna
Giordano, Cesira
Vecchione, Alessandra
Ghelardi, Emilia
Lupetti, Antonella
author_sort Florio, Walter
collection PubMed
description BACKGROUND: The application of matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry (MS) to microbial identification has allowed the development of rapid methods for identification of microorganisms directly in positive, blood cultures (BCs). These methods can yield accurate results for monomicrobial BCs, but often fail to identify multiple microorganisms in polymicrobial BCs. The present study was aimed at establishing a rapid and simple method for identification of bacteria and yeast in polymicrobial BCs from patients with bloodstream infection. RESULTS: The rapid method herein proposed is based on short-term culture in liquid media allowing selective growth of microorganisms recovered from polymicrobial BCs, followed by rapid identification by MALDI-TOF MS. To evaluate the accuracy of this method, 56 polymicrobial BCs were comparatively analyzed with the rapid and routine methods. The results showed concordant identification for both microbial species in 43/50 (86%) BCs containing two different microorganisms, and for two microbial species in six BCs containing more than two different species. Overall, 102/119 (85.7%) microorganisms were concordantly identified by the rapid and routine methods using a cut-off value of 1.700 for valid identification. The mean time to identification after BC positivity was about 4.2 h for streptococci/enterococci, 8.7 h for staphylococci, 11.1 h for Gram-negative bacteria, and 14.4 h for yeast, allowing a significant time saving compared to the routine method. CONCLUSIONS: The proposed method allowed rapid and reliable microbial identification in polymicrobial BCs, and could provide clinicians with timely, useful information to streamline empirical antimicrobial therapy in critically ill patients.
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spelling pubmed-68849142019-12-03 A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS Florio, Walter Cappellini, Susanna Giordano, Cesira Vecchione, Alessandra Ghelardi, Emilia Lupetti, Antonella BMC Microbiol Methodology Article BACKGROUND: The application of matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry (MS) to microbial identification has allowed the development of rapid methods for identification of microorganisms directly in positive, blood cultures (BCs). These methods can yield accurate results for monomicrobial BCs, but often fail to identify multiple microorganisms in polymicrobial BCs. The present study was aimed at establishing a rapid and simple method for identification of bacteria and yeast in polymicrobial BCs from patients with bloodstream infection. RESULTS: The rapid method herein proposed is based on short-term culture in liquid media allowing selective growth of microorganisms recovered from polymicrobial BCs, followed by rapid identification by MALDI-TOF MS. To evaluate the accuracy of this method, 56 polymicrobial BCs were comparatively analyzed with the rapid and routine methods. The results showed concordant identification for both microbial species in 43/50 (86%) BCs containing two different microorganisms, and for two microbial species in six BCs containing more than two different species. Overall, 102/119 (85.7%) microorganisms were concordantly identified by the rapid and routine methods using a cut-off value of 1.700 for valid identification. The mean time to identification after BC positivity was about 4.2 h for streptococci/enterococci, 8.7 h for staphylococci, 11.1 h for Gram-negative bacteria, and 14.4 h for yeast, allowing a significant time saving compared to the routine method. CONCLUSIONS: The proposed method allowed rapid and reliable microbial identification in polymicrobial BCs, and could provide clinicians with timely, useful information to streamline empirical antimicrobial therapy in critically ill patients. BioMed Central 2019-11-29 /pmc/articles/PMC6884914/ /pubmed/31783786 http://dx.doi.org/10.1186/s12866-019-1641-1 Text en © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Methodology Article
Florio, Walter
Cappellini, Susanna
Giordano, Cesira
Vecchione, Alessandra
Ghelardi, Emilia
Lupetti, Antonella
A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title_full A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title_fullStr A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title_full_unstemmed A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title_short A new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by MALDI-TOF MS
title_sort new culture-based method for rapid identification of microorganisms in polymicrobial blood cultures by maldi-tof ms
topic Methodology Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6884914/
https://www.ncbi.nlm.nih.gov/pubmed/31783786
http://dx.doi.org/10.1186/s12866-019-1641-1
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