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. 2012 Mar;18(3):473–476. doi: 10.3201/eid1803.111281

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Comparison of Escherichia coli O104:H4 isolates from Ontario. A) The XbaI pulsed-field gel electrophoresis profile of ON-2010 is distinct from those of ON-2011 and the outbreak strain from Germany. B) Optical mapping (NcoI) patterns reveal genomic similarities and differences between ON-2010, ON-2011, and the O104:H4 strain 55989. Blue, heterogeneity in siderophore biosynthesis region; red, strain-specific insertion of TetR-containing prophage.