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. 2017 Aug 30;7:9972. doi: 10.1038/s41598-017-10605-6

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© The Author(s) 2017

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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Map of estimated divergence time of HA gene of the two chicken HP H7N9 strains (CK/J1 and CK/J2) and three human HP H7N9 strains (GD/17SF003, QY/GIRD1 and GD/17SF006). Red and blue color stripes indicate the overlap time period of estimated divergence time range of HA and NA genes of each virus according to 95% HPD of TMRCA calculated by BEAST 2.0. Abbreviations: CK/J1 (A/Chicken/Guangdong/J1/2017), CK/J2 (A/Chicken/Guangdong/J1/2017), GD/17SF003 (A/Guangdong/17SF003/2016), QY/GIRD1 (A/Qingyuan/GIRD1/2017), GD/17SF006 (A/Guangdong/17SF006/2017), and HPD (highest posterior density).