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. 2015 Sep 17;15:376. doi: 10.1186/s12879-015-1116-4

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© Thompson and Tebbens. 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. 2 — Population immunity to transmission in northwest Nigeria for all 3 serotypes and different annual numbers of bOPV and tOPV SIAs. a Population immunity to serotype 1 poliovirus transmission. b Population immunity to serotype 2 poliovirus transmission. c Population immunity to serotype 3 poliovirus transmission