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. 2016 Aug 8;16:380. doi: 10.1186/s12879-016-1738-1

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Re-emergence of epidemic H3N2 strains post 2009 H1N1 pandemic. We referred to the websites of National Institute of Infectious Diseases in Japan (http://www.nih.go.jp/niid/en/) and the Influenza Virus Resource of the National Center for Biotechnology Information (NCBI) (http://www.ncbi.nlm.nih.gov/genomes/FLU/FLU.html) to obtain the annual epidemiological data for seasonal influenza virus after the 2009 pandemic. H3N2 became predominant again in the seasons immediately following the 2009 pandemic of H1N1 (2010–11 and 2011–12), although the H1N1pdm09 virus became endemic again in the 2013–14 season both in a Japan and b United States