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The fraction of children with adenovirus DNA in lymphoid cells of the adenoids and tonsils peaks at approximately 4 years of age. Adenoid and tonsil samples from 202 donors sorted by age were partitioned into 18 age groups. The percentage of adenovirus DNA-positive samples in each group is plotted as a function of the median age for the group. The solid line is a best-fit second-order local polynomial regression curve.
