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. 2020 Jun 15;16:198. doi: 10.1186/s12917-020-02413-4

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Median-joining networks of PCV2a, PCV2b and PCV2d classified according to the year of detection (see legend). The numbers of mutation steps are indicated in red numbers next to the branches. Branches without numbers represent mutation steps of one. A. PCV2a. Except of one haplotype, which is constituted of three samples, all haplotypes are constituted of one sample. The haplotypes are separated by one to 26 mutation steps from the main haplotype. B. PCV2b. One very common haplotype is shared by 34 individuals. Seven haplotypes are constituted of two to nine samples. Most haplotypes are constituted of one sample separated by one to two mutation steps from the main haplotype. Two further clades can be distinguished and the associated haplotypes are separated by up to twelve and 23 mutation steps, respectively, from the main haplotype. C. PCV2d. Except of three haplotypes, which are constituted of two to four samples, all haplotypes are constituted of one sample. The haplotypes are separated by one to two mutations steps from the main haplotype