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. 2016 Oct 5;7:12827. doi: 10.1038/ncomms12827

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Whole-genome SNP tree is shown in the centre and branches are coloured by clade. Rings indicate region of origin: inner ring, global collection; outer ring, travel-associated isolates. Subclades that contain travel-associated isolates are highlighted within the tree (shaded in alternating colours) and labelled around the outside; intrasubclade phylogenies are provided in Supplementary Fig. 4.