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. 2020 Jan 20;17:7. doi: 10.1186/s12985-020-1280-z

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© The Author(s). 2020

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 tree based on the level of a similar sequence of 72 DENV-1 strains and 47 reference viruses. The viruses fromVietnam in 2017 are denoted by D1, the strains circulated in Vietnam in the past and in the world are denoted by the country name, GenBank accession number and the year causing the disease