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. 2013 Oct 9;14(Suppl 14):S15. doi: 10.1186/1471-2105-14-S14-S15

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Copyright © 2013 Zou et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hierarchical cluster analysis of PFGE XbaI patterns of 10,198 (10,193+5) Salmonella isolates. The dendrogram shows a simplified tree-structure of 10,198 isolates of five serotypes: S. I 4, [5],12:i:- (4,5), S. Hadar (H), S. Oranienburg (O), S. Thompson (T), and S. Typhi (Ty). Five of 10,198 isolates are test isolates and labeled as T1 to T5 in various colors, while the rest of the isolates are retrieved from the PFGE database bound with the tools. The number in parentheses indicates the number of isolates in the branch squares. There are nine major clusters (C1 to C9) and 17 sub-clusters (c1 to c17) grouped by the hierarchical cluster analysis tool.