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. 2017 Mar 1;2(1):2381468317697002. doi: 10.1177/2381468317697002

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Impact of expanding the second outbreak response supplemental immunization activity (oSIA2) that targets children under 5 years of age with serotype 2 monovalent oral poliovirus vaccine (mOPV2) to older age groups with mOPV2 or with inactivated poliovirus vaccine (IPV). (a) Impact on polio incidence. (b) Impact on population immunity to transmission in comparison to the threshold effective immune proportion (EIP*) needed to stop transmission based on the basic reproduction number (R0) of serotype 2 wild or fully reverted poliovirus