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Volume 6, Issue 3

Genomic characterization of the non-O1/non-O139 strain that caused a gastroenteritis outbreak in Santiago, Chile, 2018 Open Access

Abstract

is a human pathogen, which is transmitted by the consumption of contaminated food or water. strains belonging to the serogroups O1 and O139 can cause cholera outbreaks and epidemics, a severe life-threatening diarrheal disease. In contrast, serogroups other than O1 and O139, denominated as non-O1/non-O139, have been mainly associated with sporadic cases of moderate or mild diarrhea, bacteremia and wound infections. Here we investigated the virulence determinants and phylogenetic origin of a non-O1/non-O139 strain that caused a gastroenteritis outbreak in Santiago, Chile, 2018. We found that this outbreak strain lacks the classical virulence genes harboured by O1 and O139 strains, including the cholera toxin (CT) and the toxin-coregulated pilus (TCP). However, this strain carries genomic islands (GIs) encoding Type III and Type VI secretion systems (T3SS/T6SS) and antibiotic resistance genes. Moreover, we found these GIs are wide distributed among several lineages of non-O1/non-O139 strains. Our results suggest that the acquisition of these GIs may enhance the virulence of non-O1/non-O139 strains that lack the CT and TCP-encoding genes. Our results highlight the pathogenic potential of these strains.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): gastroenteritis outbreak , multidrug resistance genomic island , non-O1/non-O139Vibrio cholerae , type III secretion system (T3SS) and type VI secretion system (T6SS)
Funding
This study was supported by the:
  • FONDECYT (Award 3190524)
    • Principle Award Recipient: David A. Montero
  • FONDECYT (Award 1161161)
    • Principle Award Recipient: Roberto Vidal
© 2020 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2020-02-20
2024-04-18
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Genomic characterization of the non-O1/non-O139 Vibrio cholerae strain that caused a gastroenteritis outbreak in Santiago, Chile, 2018
M Gen 6, e000340 (2020); https://doi.org/10.1099/mgen.0.000340
/content/journal/mgen/10.1099/mgen.0.000340
/content/journal/mgen/10.1099/mgen.0.000340
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