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Comparison of the mean AI (solid line) and the mean total IgG (dashed line) measured in young infants (n = 50). The primary three-dose vaccination series started at age 6 to 10 weeks. For the post series, serum was collected after the primary vaccination series (post-3). Prebooster serum was collected prior to delivery of the fourth dose (pre-4). Postbooster serum was collected at 4 weeks postbooster (post-4).
