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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. 1 — Flow diagram depicting breakdown of individuals enrolled, specimens collected and tested, and B. pertussis prevalence for severe respiratory (SRI) and influenza-like illness (ILI) surveillance, and controls, South Africa, June 2012 – May 2016. NP: nasopharyngeal aspirates from children < 5 years of age and combined nasopharyngeal and oropharyngeal swabs from individuals aged ≥5 years. *Confirmed = positive for B. pertussis with IS481 Ct < 35; Possible = positive for B. pertussis with IS481 35 ≥ Ct ≤ 39