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Yearly estimates of FoI. For each serotype yearly estimates of FoI as well as the 90% BCI are plotted against time. The absence of a cohort study from late 2005 to mid-2006 does not preclude the estimation of yearly FoI estimates for either 2005 or 2006, as evidenced by nonzero FoI estimates for the circulating serotypes for both of those years.
