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Antimicrobial Resistance, Virulence Genes and Genetic Relatedness of Salmonella Enterica Serotype Enteritidis Isolates Recovered From Human Gastroenteritis in Tehran, Iran Publisher Pubmed



Fardsanei F1 ; Soltan Dallal MM1, 2 ; Douraghi M1, 2 ; Memariani H3 ; Bakhshi B4 ; Zahraei Salehi T5 ; Nikkhahi F6
Authors
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Authors Affiliations
  1. 1. Division of Microbiology, Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Food Microbiology Research Centre, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
  4. 4. Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
  5. 5. Department of Microbiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
  6. 6. Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran

Source: Journal of Global Antimicrobial Resistance Published:2018


Abstract

Objectives: Salmonella enterica serotype Enteritidis is a major serotype associated with human salmonellosis. The main objective of this study was to determine the antibiotic susceptibility patterns and the presence of virulence-associated genes among S. Enteritidis strains isolated from patients with gastroenteritis in Tehran, Iran. Methods: Over a period of 14 months (May 2015 to July 2016), 44 S. Enteritidis isolates recovered from clinical sources were characterised for antimicrobial susceptibility and virulence genes. Possible genetic relatedness among the strains was also assessed using pulsed-field gel electrophoresis (PFGE). Results: Salmonella Enteritidis isolates showed high rates of resistance to ciprofloxacin (90.9%) and nalidixic acid (77.3%). Of the 44 S. Enteritidis isolates, 30 (68.2%) were resistant to three or more antibiotics. Twenty-two different antimicrobial resistance patterns were detected among the isolates. The most frequent resistance type was antibiotype 14 (resistance to ciprofloxacin, cefuroxime and nalidixic acid), occurring in 8 (18.2%) of the isolates. Notably, all of the isolates carried invA, sefA, sipA and sopE2 virulence genes. Furthermore, 17 virulence profiles were observed among the strains. The most common virulence profile was VP1 (n = 17; 38.6%), harbouring all of the virulence genes. Two distinct PFGE patterns were observed among 44 S. Enteritidis isolates. There was no association between virulence profiles or antibiotypes and PFGE clusters. Conclusions: Overall, this study provides valuable information on the virulence gene content, antibiotic resistance and genetic diversity of S. Enteritidis isolated from human sources in Iran. © 2017 International Society for Chemotherapy of Infection and Cancer
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