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. 2019 Apr 4;9:5619. doi: 10.1038/s41598-019-42122-z

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© The Author(s) 2019

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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Phylogenetic tree of sta alleles by the neighbour-joining method. The neighbour-joining tree was inferred from nucleotide sequences of all sta alleles using a p distance matrix. Strain designations and GenBank accession numbers (or WGS prefixes) are given at the branch tips. Bootstrap values based on 1000 replications (>50%) are given at the internal nodes. sta subtypes are given next to the outer brackets. The four STEC/ETEC hybrid strains in this study were highlighted in bold.