1. bookVolume 24 (2016): Issue 1 (March 2016)
Journal Details
License
Format
Journal
eISSN
2284-5623
First Published
08 Aug 2013
Publication timeframe
4 times per year
Languages
English
access type Open Access

Prevalence of virulence markers and pHS-2-like plasmids among Shigella sonnei and Shigella flexneri isolates originating from shigellosis cases in Romania

Published Online: 19 Mar 2016
Page range: 103 - 110
Received: 08 Oct 2015
Accepted: 16 Dec 2015
Journal Details
License
Format
Journal
eISSN
2284-5623
First Published
08 Aug 2013
Publication timeframe
4 times per year
Languages
English
Abstract

The surveillance of shigellosis is carried out under the auspice of the European Centre for Disease Prevention and Control which requires a reliable laboratory-based surveillance at national level. To date, little information is published about the members of Shigella spp. responsible for Romanian cases of shigellosis which hinders the understanding of the current epidemiology of shigellosis. Consequently, this retrospective study aimed to assess the diversity of virulence profiles displayed by the strains circulating in our region, by using key chromosome- and plasmid-associated markers, and to document the prevalence of pHS-2-like plasmid previously proposed as a potential marker for reactive arthritis.

The study focused on 65 Shigella sonnei and 49 Shigella flexneri clinical isolates, originated from local patients, recovered through the national surveillance system in 2009 - 2013. PCR assays were performed for the detection of ipaH, ipaBCD, ial, sen, set1A, set1B, sat, and pic genes, and a PCR-sequencing approach on plasmid preparations was used for identifying pHS-2-specific sequences.

Overall, the virulence markers ranged in prevalence from 21% (set1A, set1B, pic) to 100% (ipaH). S. flexneri isolates displayed a higher content of virulence markers than S. sonnei, the most common genotype, detected exclusively in S. flexneri serotype 2a isolates, being defined by the association ipaH+ipaBCD+ial+sen+sat+set1A+ set1B+pic. pHS-2-like plasmids were found in S. flexneri isolates of various serotypes suggesting the potential to trigger postinfection complications in specific subjects.

This study provided baseline data regarding the molecular characteristics of the Shigella strains from Romania, useful for defining the picture of shigellosis in our region.

Keywords

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