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The classical Bordetella species and MALDI-TOF technology: a brief experience.
Journal of Medical Microbiology 2018 October 30
PURPOSE: The aim of this work was to evaluate and optimize the identification of Bordetella pertussis, Bordetella parapertussis and Bordetella bronchiseptica (usually known as the classical Bordetella species) using Bruker Biotyper matrix-assisted laser desorption ionization/time-of-flight mass spectrometry (MALDI-TOF MS).
METHODOLOGY: A set of 106 previously characterized clinical isolates was used. The results were interpreted according to the manufacturer's recommendations and, in addition, a new score value cutoff was used for species identification. Further, the 10 % rule (previously adopted by other authors) and the new 5 % breaking point (proposed in this work) were evaluated in order to optimize identification rates.Results/Key findings. Our results suggest that it is possible to distinguish different species of the classical Bordetella species by following a simple algorithm without additional testing being required.
CONCLUSION: MALDI-TOF might be a reliable tool for the identification of this group of bacteria when a combination of cutoff scores is used. This procedure allows us to increase the identification rates for the classical Bordetella species significantly; however, more studies will be required to determine the applicability of the method to other difficult-to-distinguish organisms.
METHODOLOGY: A set of 106 previously characterized clinical isolates was used. The results were interpreted according to the manufacturer's recommendations and, in addition, a new score value cutoff was used for species identification. Further, the 10 % rule (previously adopted by other authors) and the new 5 % breaking point (proposed in this work) were evaluated in order to optimize identification rates.Results/Key findings. Our results suggest that it is possible to distinguish different species of the classical Bordetella species by following a simple algorithm without additional testing being required.
CONCLUSION: MALDI-TOF might be a reliable tool for the identification of this group of bacteria when a combination of cutoff scores is used. This procedure allows us to increase the identification rates for the classical Bordetella species significantly; however, more studies will be required to determine the applicability of the method to other difficult-to-distinguish organisms.
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