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. 2018 Jan 24;7:6. doi: 10.1038/s41426-017-0001-1

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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 — a The sampling location in Ningxia, western China. The ratio of the number of isolated viruses to the number of samples is indicated in parentheses. b Phylogenetic tree of HA showing relationships of emergent influenza A(H5N6) viruses with clade 2.3.4.4 H5 avian influenza viruses and c phylogenetic tree of PB1 showing that 17 PB1 genes cluster into three groups named Group A (red), Group B (green), and Group C (blue), evolving from Mongolia-like LPAIVs