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. 2020 Jun 10;11:1137. doi: 10.3389/fmicb.2020.01137

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Copyright © 2020 Chen, Han, Wu, Xu, Yu and Zhang.

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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The phylogenetic tree based on the entire VP1 genome of 36 representative strains isolated from 1958 (Bastianni strain of E-30 prototype) to 2016, with the E-21 strain used as an outgroup. The black triangle indicates the strains isolated from this study, and one strain was included for genotyping. The node numbers at each node show the bootstrap support constructed by neighbor-joining method with 1,000 bootstrap replicates. The letters on the right represent the genotypes of E-30, from genotypes A–C.