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. 2013 Jun 6;8(6):e65716. doi: 10.1371/journal.pone.0065716

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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A minimal spanning tree was constructed of 286 MLVA/ompA types representing the non-O157 STEC strains isolated by M3. Node size indicates the relative number of isolates of that type; i.e. the smallest size node represents a single strain of that type. The nodes are color-coded by farm/ranch site code (Panel A) and by sample source (Panel B). Human clinical isolates RM12844 and RM12856 (OregonPublic Health, 2010) and RM14735 (Germany Fenugreek Outbreak strain, MA Dept. Public Health 2011) are included for comparison only.