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European Journal of Clinical Microbiology & Infectious Diseases

Erschienen in:

08.10.2020 | Original Article

Comparison of conventional molecular and whole-genome sequencing methods for subtyping Salmonella enterica serovar Enteritidis strains from Tunisia

verfasst von: Boutheina Ksibi, Sonia Ktari, Houcemeddine Othman, Kais Ghedira, Sonda Maalej, Basma Mnif, Mohamed salah Abbassi, Laetitia Fabre, Faouzia Rhimi, Simon Le Hello, Adnene Hammami

Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases | Ausgabe 3/2021

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Abstract

We sought to determine the relative value of conventional molecular methods and whole-genome sequencing (WGS) for subtyping Salmonella enterica serovar Enteritidis recovered from 2000 to 2015 in Tunisia and to investigate the genetic diversity of this serotype. A total of 175 Salmonella Enteritidis isolates were recovered from human, animal, and foodborne outbreak samples. Pulsed-field gel electrophoresis (PFGE), multiple locus variable-number tandem repeat analysis (MLVA), and whole-genome sequencing were performed. Eight pulsotypes were detected for all isolates with PFGE (DI = 0.518). Forty-five Salmonella Enteritidis isolates were selected for the MLVA and WGS techniques. Eighteen MLVA profiles were identified and classified into two major clusters (DI = 0.889). Core genome multilocus typing (cgMLST) analysis revealed 16 profiles (DI = 0.785). Whole-genome analysis indicated 660 single-nucleotide polymorphism (SNP) divergences dividing these isolates into 43 haplotypes (DI = 0.997). The phylogenetic tree supported the classification of Salmonella Enteritidis isolates into two distinct lineages subdivided into five clades and seven subclades. Pairwise SNP differences between the isolates ranged between 302 and 350. We observed about 311 SNP differences between the two foodborne outbreaks, while only less or equal to 4 SNP differences within each outbreak. SNP-based WGS typing showed an excellent discriminatory power comparing with the conventional methods such as PFGE and MLVA. Besides, we demonstrate the added value of WGS as a complementary subtyping method to discriminate outbreak from non-outbreak isolates belonging to common subtypes. It is important to continue the survey of Salmonella Enteritidis lineages in Tunisia using WGS.

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Titel: Comparison of conventional molecular and whole-genome sequencing methods for subtyping Salmonella enterica serovar Enteritidis strains from Tunisia
verfasst von: Boutheina Ksibi
Sonia Ktari
Houcemeddine Othman
Kais Ghedira
Sonda Maalej
Basma Mnif
Mohamed salah Abbassi
Laetitia Fabre
Faouzia Rhimi
Simon Le Hello
Adnene Hammami
Publikationsdatum: 08.10.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases / Ausgabe 3/2021
Print ISSN: 0934-9723
Elektronische ISSN: 1435-4373
DOI: https://doi.org/10.1007/s10096-020-04055-8

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Comparison of conventional molecular and whole-genome sequencing methods for subtyping Salmonella enterica serovar Enteritidis strains from Tunisia

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