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. 2018 Aug 7;18:375. doi: 10.1186/s12879-018-3274-7

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© The Author(s). 2018

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 — Summary of PRNT results and the classification of immune status. For each immune status category the PRNT titres are summarized in terms of median (IQR), with the current serotype shown in bold. In the blank cells titres were either unmeasurable or low (≥ 10 < 20)