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

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Percent prevalence (y-axis) of Ab to Wb123 by age group (x-axis) in CAg− individuals on Mauke from 1975 (red line) and 1992 (blue line). Asterisks represent a significant difference (p≤0.04; Fisher's exact test) between the prevelances in 1975 and 1992 within a given age group.