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. 2019 Mar 21;19:276. doi: 10.1186/s12879-019-3869-7

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© The Author(s). 2019

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. 2 — Distribution of real-time PCR IS481 C_t values for confirmed (n = 90) and possible (n = 56) pertussis cases, by surveillance population, South Africa, June 2012 – May 2016. SRI = severe respiratory illness; ILI = influenza-like illness