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. 2017 May 4;7:1512. doi: 10.1038/s41598-017-01761-w

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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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Phylogenetic tree of the complete genome of the H7N9 viruses isolated from two family clusters in Fujian province, Southeast China. H7N9 viruses isolated from the first, second, third, and forth epidemic waves of human infection with avian influenza A (H7N9) virus are marked with circles, open circles, triangles, and open triangles, respectively. The viruses isolated from the two family clusters are indicated by red triangles.