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. 2018 May 16;14:160. doi: 10.1186/s12917-018-1480-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 2 — Phylogenetic analysis using ORF5 nucleotide sequences of Type 1 (a) and Type 2 PRRS (b) field isolates obtained from this study and the GenBank database. The tree was constructed by maximum-likelihood method and the grouping was referred from the previous studies [30, 31, 56]. Prototype viruses of each type, vaccine viruses used in Korean swine farms and Korean reference strains were marked with ◆, ★ and ▲, respectively. CRESA11 was marked with ●. A group of NADC30-like viruses was magnified in (c)