For each pertussis antigen, lower day 31 immune responses were observed in the 2 RSVPreF3 groups versus the dTpa_placebo group: GMCs of anti-PT antibodies (45.1–50.1 vs 59.5 IU/mL), anti-FHA antibodies (192.9–210.3 vs 265.6 IU/mL), and anti-PRN antibodies (221.3–259.6 vs 361.1 IU/mL) (Figure 5 and Supplementary Table 8). Here, CIAO3 is linked to pertussis.