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. 2019 Jul 25;9:10782. doi: 10.1038/s41598-019-47209-1

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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 based on PCV2 ORF2 gene sequences. The tree was constructed using the maximum-likelihood method based on the general time reversible (GTR) model with a gamma-distributed rate (five rate categories) and an invariant site (I). Taiwanese PCV2 strains were labeled with solid dots of different colors: red, blue-green, bright-green, and bright-blue dots represent samples collected from 2016–2017, 2012–2015, 2002–2011, and 2001–2010, respectively.