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. 2017 Sep 26;7:12324. doi: 10.1038/s41598-017-12415-2

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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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Epidemiological characteristics of the 2009 H1N1 influenza pandemic in England. (a) Age-specific seroprevalence (mean, 95% CI) by age group and region as reported in⁴⁵, (proportion of serum samples with haemagglutination inhibition titre 1:32 or more) and as estimated by model M5, as of August 2009 (i.e., at the end of the first epidemic wave). Regions are grouped as in the original works^4,5; WMid corresponds to West Midlands. (b) as a, but as of January 2010 (i.e., at the end of the second wave).