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. 2015 Oct 26;15:460. doi: 10.1186/s12879-015-1182-7

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© Morgan and David. 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. 4 — Type II emerging pathogens (see text), annual citations per 1000 citations in PubMed for 1963–2014; also shown is the incidence of cases per 100,000 world population for (a) Severe Acute Respiratory Syndrome (SARS), (b) Ebola virus disease and (c) Middle Eastern Respiratory Syndrome (MERS). See Table 1 for PubMed search criteria. *Note y-axis scales differ to make trends comparable