The effect of preexisting antibodies from Tdap vaccination during pregnancy on infant antibody responses to the pertussis-containing vaccines.

7 In the DTwP-vaccinated infant group, there was a trend of lower geometric mean concentrations (GMCs) of anti-PT, anti-DT, and anti-TT IgG at month 7 among the high baseline IgG group; however, this did not reach statistical significance ( Table 1 ).

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