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. 2012 Dec 6;6(12):e1940. doi: 10.1371/journal.pntd.0001940

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Prevalence of Ab to Wb123 (i.e. the percent positive for Ab) in children ≤5 years old in 1975. The red bar for children <1 year presumably indicates the presence of maternal Ab.