Dataset Information

Complete Genome Sequences of Three Salmonella enterica subsp. enterica Serovar Saintpaul Isolates Associated with a 2013 Multistate Outbreak in the United States.

ABSTRACT: In 2013, a multistate outbreak of Salmonella enterica subsp. enterica serovar Saintpaul from cucumber caused 84 cases of salmonellosis in the United States. In this announcement, we report the complete genome sequences of three clinical Salmonella Saintpaul isolates associated with the 2013 outbreak.

SUBMITTER: Yao K

PROVIDER: S-EPMC5454210 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Complete Genome Sequences of Three Salmonella enterica subsp. enterica Serovar Saintpaul Isolates Associated with a 2013 Multistate Outbreak in the United States.

Yao Kuan K Muruvanda Tim T Allard Marc W MW Hoffmann Maria M

Genome announcements 20170601 22

In 2013, a multistate outbreak of Salmonella enterica subsp. enterica serovar Saintpaul from cucumber caused 84 cases of salmonellosis in the United States. In this announcement, we report the complete genome sequences of three clinical Salmonella Saintpaul isolates associated with the 2013 outbreak. ...[more]

PMID: 28572327

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Project description:Salmonella enterica serovar Heidelberg is currently the 12th most common serovar of Salmonella enterica causing salmonellosis in the United States and results in twice the average incidence of blood infections caused by nontyphoidal salmonellae. Multiple outbreaks of salmonellosis caused by Salmonella Heidelberg resulted from the same poultry processor, which infected 634 people during 2013 and 2014. The hospitalization and invasive illness rates were 38% and 15%, respectively. We hypothesized that the outbreak strains of Salmonella Heidelberg had enhanced stress tolerance and virulence capabilities. We sourced nine food isolates collected during the outbreak investigation and three reference isolates to assess their tolerance to heat and sanitizers, ability to attach to abiotic surfaces, and invasiveness in vitro We performed RNA sequencing on three isolates (two outbreak-associated isolates and a reference Salmonella Heidelberg strain) with various levels of heat tolerance to gain insight into the mechanism behind the isolates' enhanced heat tolerance. We also performed genomic analyses to determine the genetic relationships among the outbreak isolates. Ultimately, we determined that (i) six Salmonella Heidelberg isolates associated with the foodborne outbreak had enhanced heat tolerance, (ii) one outbreak isolate with enhanced heat tolerance also had an enhanced biofilm-forming ability under stressful conditions, (iii) exposure to heat stress increased the expression of Salmonella Heidelberg multidrug efflux and virulence genes, and (iv) outbreak-associated isolates were likely transcriptionally primed to better survive processing stresses and, potentially, to cause illness.IMPORTANCE This study provides a deep analysis of the intrinsic stress tolerance and virulence capabilities of Salmonella Heidelberg that may have contributed to the length and severity of a recent salmonellosis outbreak. Additionally, this study provides a comprehensive analysis of the transcriptomic response of S. enterica strains to heat stress conditions and compares baseline stationary-phase gene expression among outbreak- and non-outbreak-associated Salmonella Heidelberg isolates. These data can be used in assay development to screen isolates for stress tolerance and subsequent survival. This study adds to our understanding of the strains associated with the outbreak and informs ongoing regulatory discussions on Salmonella in poultry.

Dataset Information

Complete Genome Sequences of Three Salmonella enterica subsp. enterica Serovar Saintpaul Isolates Associated with a 2013 Multistate Outbreak in the United States.

Publications

Complete Genome Sequences of Three <i>Salmonella enterica</i> subsp. <i>enterica</i> Serovar Saintpaul Isolates Associated with a 2013 Multistate Outbreak in the United States.

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