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. 2015 Apr 27;6:301. doi: 10.3389/fmicb.2015.00301

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Copyright © 2015 Barco, Barrucci, Cortini, Ramon, Olsen, Luzzi, Lettini and Ricci.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Minimum spanning tree based on the MLVA profiles observed for S. Typhimurium isolates. Each node corresponds to a MLVA profile and each node size is proportional to the number of isolates displaying this particular profile. The length and thickness of the branches are proportional to the number of the loci differing between two profiles. The color code used reflects the origin of the isolates: light blue, human; purple, pig; green, cattle; red, chicken; yellow, turkey. Halos indicate different clonal complexes.