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. 2018 Mar 7;8:4118. doi: 10.1038/s41598-018-22494-4

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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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Recombination analysis of the three PRRSV strains. Recombination analysis of SDhz1512 (A) SDlz1601 (B) and SDYG1606 (C) using SimPlot with a sliding window of 500 nt, moving in 20 nt steps. Genome scale similarity comparisons of three PRRSV strains (query) with NADC30 (parental group A, red), JXA1 (parental group B green), and VR2332 (outgroup C, blue). Recombination breakpoints are shown as dotted lines, with the locations indicated at the bottom. The background color of parental region A (with reference to the NADC30 strain) is light green, whereas that of parental region B (HP-PRRSV JXA1) is shaded light purple and that of parental region C (VR2332) is shaded white. The phylogenies of parental region A(c), parental region B(b), and parental region C(d) are shown below the similarity plot.