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. 2019 Aug 8;19:185. doi: 10.1186/s12866-019-1551-2

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© The Author(s). 2019

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 — Minimum spanning tree (MST) analysis of four populations of GBS isolates according to sequence type (ST). a EOGBS; b LOGBS; c NCGBS; d MCGBS. In the MST, circles represent the STs, and the areas of each of circles indicate the prevalence of the ST in the input data. Lines are used to show the radial links from the founder to each of its single-locus variants (SLVs). The primary founder of a group is defined as the ST that differs from the largest number of other STs at only a single locus, and it is coloured blue. The user-selected primary founder is coloured red. A ST that appears to have diversified to produce multiple SLVs is called a subgroup founder, which is coloured yellow