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. 2020 Oct 20;8:e10114. doi: 10.7717/peerj.10114

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©2020 Liang et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) A phylogenetic tree was generated by using the MEGAX package. The evolutionary history was inferred by using the Maximum Likelihood method based on the TN93 model. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. GenBank accession numbers of strains, years, places of isolation, genogroups, and subgroups are shown. (B) A Maximum Likelihood tree was generated by using the BEAST 2 package. Gamma correction for site heterogeneity and the GTR model were selected for the tree generation. GenBank accession numbers of strains, years, places of isolation, genogroups, and subgroups are shown. (C) Line chart shows the number of PEDV sequences obtained by gene subgroup and year of sampling. Yearly percentages of samples positive for PEDV are indicated by different colored lines.