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. 2016 Oct 4;13(10):e1002140. doi: 10.1371/journal.pmed.1002140

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© 2016 Pons-Salort et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — (A) Estimated serotype-2 population immunity in children <36 mo of age and (B) number of cVDPV2 cases, for 6-mo periods from January–June 2004 to January–June 2015. The first cVDPV2 cases were reported during the second half of 2005. The publication of this map does not imply the expression of any opinion whatsoever on the part of WHO concerning the legal status of any territory, city, or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.