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. 2021 Dec 1;8:759861. doi: 10.3389/fvets.2021.759861

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Copyright © 2021 Jiang, Wang, Zhang, Niu, Huang, Gao, Liu, Gao, Li, Pan, Liu, Zhang, Cui, Wang and Qi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Phylogenetic analysis of the nucleotide sequences of the B-marker of the VP1 gene. The tree was generated by the maximum likelihood method using MEGA6 Software. The tree was visualized in iTOL. The tree was drawn to scale, with branch lengths measured in the number of substitutions per site. Only branches supported by a bootstrap value above 60% were displayed. The analysis involved 20 nucleotide sequences, and 50 strains detected in this study were highlighted with a solid circle (•). Five genogroups based on B-marker of the VP1 gene in segment B were marked.