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. 2018 Jul 7;36(33):5030–5036. doi: 10.1016/j.vaccine.2018.07.004

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© 2018 Elsevier Ltd. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Supplementary Fig. S1 — Phylogenetic tree of the HA gene sequences. The eight H7N9 viruses used in this study are marked with red circles in the back. The H7N9 candidate vaccine viruses (CVV) recommended by WHO are labeled with black boxes in the front. Branch lengths are drawn to scale.