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. 2018 Jun 29;8:9864. doi: 10.1038/s41598-018-28169-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Analysis of Salmonella SPIs 1 to 5. The inner black circle corresponds to the reference strain Typhimurium LT2, followed by GC skew [(G − C)/(G + C)]. Regions of GC content above average are drawn in green, whereas regions below average are in purple. The remaining slots represents (from inner to outer rings) serovars Montevideo (n = 29), Give (n = 8), Muenster (n = 6), Newport (n = 4), Derby (n = 4), Reading, Roodepoort and Senftenberg (n = 2 each), London and Bergen (n = 1 each). Within each slot, the higher the colour intensity, the higher the nucleotide similarity to the reference strain.