Fig 3.

Serum IgG levels against PT, PRN, FHA, FIM 2/3, DT, and TT in post-partum women immunized with Adacel Tdap. Women were vaccinated 1–4 days after delivery. Data represent antibody titers before (0) and 0.5–24 months after post-partum Tdap vaccination. Fifty-three women provided samples at day 0; 34 remained in the study and provided blood at 24 months. Dotted lines represent protective thresholds, when available. ****P < 0.0001 by Wilcoxon signed-rank test. DT, diphtheria toxoid; FHA, filamentous hemagglutinin; FIM, fimbriae; PRN, pertactin; PT, pertussis toxin; TT, tetanus toxin.