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. 2017 Aug 3;13:55. doi: 10.1186/s12992-017-0284-y

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© The Author(s). 2017

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 — VOSviewer co-occurrence term map. a Term map of title and abstract words in West Nile virus publications during 1943–1999 with research topics indicated (based on VOS Viewer). b Term map of title and abstract words in West Nile virus publications during 2000–2006 with research topics indicated (based on VOS Viewer). c Term map of title and abstract words in West Nile virus publications during 2007–2016 with research topics indicated (based on VOS Viewer)