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editorial

. 2018 Mar 14;7:26. doi: 10.1038/s41426-018-0024-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Midpoint rooted phylogenetic tree derived using FastTree and the generalised time-reversible nucleotide substitution model. Percentage Shimodaira-Hasegawa-like local support values are shown for key nodes estimated from 1,000 resamples¹⁵. Whole-genome sequences were obtained for 11 CHIKV strains imported into Australia between 2010 and 2017 (GenBank accession numbers MF773559-MF773569). New sequences from the current study are highlighted in blue text. Collapsed clades within the Asian genotype labelled (A, B, C, D) and (E) represent the following sequences with GenBank accession numbers: (A) EF027140, EF027141, HM045788, HM045803 and HM045813; (B) HM045787, HM045789, HM045796, HM045802, KX262987 and KX262988; (C) HM045790, HM045791, HM045797 and HM045800; (D) EU703759-EU703762, KM923917-KM923920, FN295483 and FN295484; (E) FJ807897, MF773561 and MF773565. Green shading indicates the American clade (includes the Saint Martin, Caribbean 2013 sequence, KX262991 within the collapsed clade (K) and 302 other sequences sharing 99.6% to 100% nucleotide identity) within the Asian genotype. The number of sequences within the American collapsed clades include: (F) 2; (G) 2; (H) 7; (I) 4; (J) 11; (K) 191; (L) 2 and (M) 81. The inset shows the 3′ untranslated region nucleotide alignment of representative Asian genotype strains (subset of 30 sequences taken from original alignment of 270 sequences) and the position of signature, three or four nucleotide deletions (genome positions 11,406 to 11,408 or 11,409, with numbering based on the Philippine 2012 sequence, KT308163), which were detected in the Philippine MF773563 (2014) and MF773564 (2016) sequences, the French Polynesian KR559473 (2015) sequence and 214 American sequences.