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Title: Genomic Comparison of Escherichia coli O104:H4 Isolates from 2009 and 2011 Reveals Plasmid, and Prophage Heterogeneity, Including Shiga Toxin Encoding Phage stx2

Journal Article · · PLoS ONE
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Naval Medical Research Center and Henry M. Jackson Foundation for Military Medicine, Frederick, MD (United States)
  3. U.S. Army Research Inst. for Infectious Disease, Frederick, MD (United States)
  4. U.S. Army Edgewood Chemical Biological Center, Aberdeen Proving Ground, MD (United States)
  5. National Center for Disease Control and Public Health, Tbilisi (Republic of Georgia). South Caucasus Field Epidemiology. Lab. Training Program
  6. Centers for Disease Control and Prevention (CDC), Atlanta, GA (United States). Enteric Diseases Lab. Branch
  7. U.S. Army Edgewood Chemical Biological Center, Aberdeen Proving Ground, MD (United States); Excet Inc, Springfield, VA (United States)
  8. U.S. Army Edgewood Chemical Biological Center, Aberdeen Proving Ground, MD (United States); Science Applications International Corporation, Abingdon, MD (United States)
  9. BioTeam, Inc., Middleton, MA (United States)
  10. U.S. Army Research Inst. for Infectious Disease, Frederick, MD (United States); Team Ke’aki Tech, Frederick, MD (United States)
  11. Defense Threat Reduction Agency, Alexandria, VA (United States)

In May of 2011, an enteroaggregative Escherichia coli O104:H4 strain that had acquired a Shiga toxin 2-converting phage caused a large outbreak of bloody diarrhea in Europe which was notable for its high prevalence of hemolytic uremic syndrome cases. Several studies have described the genomic inventory and phylogenies of strains associated with the outbreak and a collection of historical E. coli O104:H4 isolates using draft genome assemblies. We present the complete, closed genome sequences of an isolate from the 2011 outbreak (2011C–3493) and two isolates from cases of bloody diarrhea that occurred in the Republic of Georgia in 2009 (2009EL–2050 and 2009EL–2071). Comparative genome analysis indicates that, while the Georgian strains are the nearest neighbors to the 2011 outbreak isolates sequenced to date, structural and nucleotide-level differences are evident in the Stx2 phage genomes, the mer/tet antibiotic resistance island, and in the prophage and plasmid profiles of the strains, including a previously undescribed plasmid with homology to the pMT virulence plasmid of Yersinia pestis. In addition, multiphenotype analysis showed that 2009EL–2071 possessed higher resistance to polymyxin and membrane-disrupting agents. Finally, we show evidence by electron microscopy of the presence of a common phage morphotype among the European and Georgian strains and a second phage morphotype among the Georgian strains. The presence of at least two stx2 phage genotypes in host genetic backgrounds that may derive from a recent common ancestor of the 2011 outbreak isolates indicates that the emergence of stx2 phage-containing E. coli O104:H4 strains probably occurred more than once, or that the current outbreak isolates may be the result of a recent transfer of a new stx2 phage element into a pre-existing stx2-positive genetic background.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; Defense Threat Reduction Agency (DTRA)
Contributing Organization:
Threat Characterization Consortium
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1627555
Journal Information:
PLoS ONE, Vol. 7, Issue 11; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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When Whole-Genome Alignments Just Won't Work: kSNP v2 Software for Alignment-Free SNP Discovery and Phylogenetics of Hundreds of Microbial Genomes journal December 2013
DNA microarray-based assessment of virulence potential of Shiga toxin gene-carrying Escherichia coli O104:H7 isolated from feedlot cattle feces journal April 2018
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Genomic Microbial Epidemiology Is Needed to Comprehend the Global Problem of Antibiotic Resistance and to Improve Pathogen Diagnosis journal June 2016
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Predominance of CTX-M-15 among ESBL Producers from Environment and Fish Gut from the Shores of Lake Victoria in Mwanza, Tanzania journal December 2016
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