<abstract xmlns="http://www.w3.org/1999/xhtml">

<italic>Wautersiella falsenii</italic> is a rarely non-fermenting Gram-negative bacterium and belongs to the <italic>Flavobacteriaceae</italic> family. This nosocomial pathogen can cause several human infections, especially among immunocompromised patients. Here, we describe the whole genome sequence of a clinical <italic>W. falsenii</italic> strain isolated from a urine sample of a 35-year-old woman with a urinary tract infection in Tunisia. We investigated its phenotype and genotype.
After bacterial identification by the MALDI-TOF method, the whole-genome sequencing of this strain was performed. This isolate was not susceptible to various antibiotics, including β-lactams, aminoglycosides, and quinolones. However, it remains susceptible to imipenem (MIC = 0.25 mg/l), ertapenem (MIC = 0.75 mg/l), and meropenem (MIC = 0.19 mg/l). Interestingly, the E-TEST® (MP/MPI) showed a reduced MIC of meropenem +/− EDTA (0.064 μg/ml). Besides, the color change from yellow to red in the β CARBA test only after 24 hours of incubation can be interpreted in two ways. On the one hand, as a likely low expression of the gene encoding metallo-β-lactamase. On the other hand, and more likely, it may be a false-positive result because, according to the test manufacturer's recommendations, the test should be read after 30 minutes. Perhaps, therefore, this gene is not expressed in the tested strain. Moreover, the whole-genome sequence analysis demonstrated the presence of a novel chromosomally located subclass B1 metallo-β-lactamase EBR-like enzyme, sharing 94.92% amino acid identity with a previously described carbapenemase produced by <italic>Empedobacter brevis</italic>, EBR-1. The results also showed the detection of other antibiotic resistance genes and the absence of plasmids. So far, this study is the first report on the detection of <italic>W. falsenii</italic> in Tunisia. These findings prove that <italic>W. falsenii</italic> could be a potential reservoir of antibiotic resistance genes, e.g., β-lactamases. Collaborative efforts and effective hygiene measures should be established to prevent the emergence of this species in our health care settings.
</abstract>

Wautersiella falsenii is a rarely non-fermenting Gram-negative bacterium and belongs to the Flavobacteriaceae family. This nosocomial pathogen can cause several human infections, especially among immunocompromised patients. Here, we describe the whole genome sequence of a clinical W. falsenii strain isolated from a urine sample of a 35-year-old woman with a urinary tract infection in Tunisia. We investigated its phenotype and genotype.
After bacterial identification by the MALDI-TOF method, the whole-genome sequencing of this strain was performed. This isolate was not susceptible to various antibiotics, including β-lactams, aminoglycosides, and quinolones. However, it remains susceptible to imipenem (MIC = 0.25 mg/l), ertapenem (MIC = 0.75 mg/l), and meropenem (MIC = 0.19 mg/l). Interestingly, the E-TEST® (MP/MPI) showed a reduced MIC of meropenem +/− EDTA (0.064 μg/ml). Besides, the color change from yellow to red in the β CARBA test only after 24 hours of incubation can be interpreted in two ways. On the one hand, as a likely low expression of the gene encoding metallo-β-lactamase. On the other hand, and more likely, it may be a false-positive result because, according to the test manufacturer's recommendations, the test should be read after 30 minutes. Perhaps, therefore, this gene is not expressed in the tested strain. Moreover, the whole-genome sequence analysis demonstrated the presence of a novel chromosomally located subclass B1 metallo-β-lactamase EBR-like enzyme, sharing 94.92% amino acid identity with a previously described carbapenemase produced by Empedobacter brevis, EBR-1. The results also showed the detection of other antibiotic resistance genes and the absence of plasmids. So far, this study is the first report on the detection of W. falsenii in Tunisia. These findings prove that W. falsenii could be a potential reservoir of antibiotic resistance genes, e.g., β-lactamases. Collaborative efforts and effective hygiene measures should be established to prevent the emergence of this species in our health care settings.

Detection by Whole-Genome Sequencing of a Novel Metallo-β-Lactamase Produced by <italic>Wautersiella falsenii</italic> Causing Urinary Tract Infection in Tunisia

Aix-Marseille Université MEPHI, AP-HM, IRD, IHU Méditerranée Infection

Laboratoire des Microorganismes et Biomolécules Actives

Laboratoire de Recherche Sciences et Technologies de l’Environnement

Institut Supérieur des Sciences et Technologies de l’Environnement de Borj-Cedria

Polish Journal of Microbiology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Detection by Whole-Genome Sequencing of a Novel Metallo-β-Lactamase Produced by  Causing Urinary Tract Infection in Tunisia

Wautersiella falsenii is a rarely non-fermenting Gram-negative bacterium and belongs to the Flavobacteriaceae family. This nosocomial pathogen can cause...

Detection by Whole-Genome Sequencing of a Novel Metallo-β-Lactamase Produced by Wautersiella falsenii Causing Urinary Tract Infection in Tunisia

Article Category: Original Paper

Published Online: Feb 27, 2022

Page range: 73 - 81

Received: Aug 20, 2021

Accepted: Nov 22, 2021

DOI: https://doi.org/10.33073/pjm-2022-010

Keywords
MALDI-TOF, whole-genome sequencing, metallo-β-lactamase, urinary tract infection, Tunisia

© 2022 Raouaa Maaroufi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Detection by Whole-Genome Sequencing of a Novel Metallo-β-Lactamase Produced by Wautersiella falsenii Causing Urinary Tract Infection in Tunisia

Article Category: Original Paper

Published Online: Feb 27, 2022

Page range: 73 - 81

Received: Aug 20, 2021

Accepted: Nov 22, 2021

DOI: https://doi.org/10.33073/pjm-2022-010

KeywordsMALDI-TOF, whole-genome sequencing, metallo-β-lactamase, urinary tract infection, Tunisia

© 2022 Raouaa Maaroufi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
MALDI-TOF, whole-genome sequencing, metallo-β-lactamase, urinary tract infection, Tunisia