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. 2015 Dec 1;15:551. doi: 10.1186/s12879-015-1247-7

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© Ladhani et al. 2015

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 — Age distribution of cases (a) and case fatality ratio (b) by age-group and linkage group in England during 2007–11