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. 2018 Jan 31;65(3):883–889. doi: 10.1111/tbed.12825

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© 2018 Blackwell Verlag GmbH

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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(a) Box plot of nucleotide identities compared to CV777 for strains from 2012 to 2017. All strains were separated into six groups according to their collection time, and their nucleotide identities with CV777 strain were calculated. (b) The comparison of sequences for S indel strains and CV777 strain. Three S indel strains were aligned with CV777 strain. Grey line indicated a deletion in S indel strains compared with CV777 strain [Colour figure can be viewed at http://wileyonlinelibrary.com]