Abstract
We first studied the immunogenicity of PRP-T and DTwP vaccines in Filipino infants given at 6, 10 and 14 weeks concomitantly with either an aluminum adjuvanted eleven-valent pneumococcal conjugate vaccine (11PncTD) or a meningococcal diphtheria-conjugated vaccine as compared to a control group that received only DTwP/PRP-T. The GMCs and proportions of infants achieving protective antibody concentrations to DTwP and PRP-T vaccine antigens were similar among the groups. In the second phase, the control group received 11PncTD at 18 weeks and the antibody concentrations were measured at 9 months in all children; 11PncTD induced a booster response to diphtheria in the control group. There was no negative interference from concomitant administration of new conjugate vaccines. In contrast, 11PncTD can boost the antibody response to the carrier proteins.
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