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. 2021 May 28;11:11276. doi: 10.1038/s41598-021-90512-z

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Antigenic distances of the EU H1av isolates (a) and EU H1hu isolates (b) from their ancestor viruses swFI82 and TW86 respectively. The virus isolates are shown in orange circles while the reference viruses are colored differently; green circle EU H1av, magenta circle EU H1hu and grey circle Human H1.