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. 2017 Mar 1;17:47. doi: 10.1186/s12866-017-0963-0

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — PFGE profiles and clusters of O26 isolates investigated in this study. All 88 isolates were analysed by PFGE with XbaI, and cluster analysis of the patterns was performed by BioNumerics V7.5 software using the Dice coefficient and unweighted pair group method (UPGMA). The degree of similarity (%) is shown on the scale at the top left of the figure. The cut-off level of 90% was chosen to assign isolates to the same cluster. At 74% similarity isolates were assigned to 2 clusters (a & b)