Overall prevalence of seropositivity to A(H1N1)pdm09 at baseline and December 2009, by age group.
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aEstimates were weighted using the adjusted sample weight for this sample, WTH1N1. bAssuming no pre-existing seropositivity at baseline. cAge-standardized to the U.S. Census Bureau population estimates as of July 1, 2009 by age groups in the table.
创建时间：
2012-10-31
