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. 2018 Jan 31;69:1–7. doi: 10.1016/j.ijid.2018.01.012

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© 2018 The Authors

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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Phylogenetic comparison based on the similarity of HA1 subunit of influenza strains from this study and circulating/vaccine viral strains in 2013/14 and 2014/15. Nucleotide sequences were assembled with the Seqman program (Lasergene99 package, DNASTAR). The phylogenetic tree was created with MEGA software version 6, using the maximum likelihood method, Hasegawa–Kishino–Yano nucleotide distances and bootstrapped with 500 replicates.