IL4 and pertussis: At five months of age (one month after completion of pediatric pertussis vaccination), the significantly reduced IL-10 response to B. pertussis was still seen in infants from Tdap-IPV-vaccinated pregnancies, as well as lower IL-4 (IL-4 -1.37, 95% CI [-2.53, -0.22], p=0.02; IL-10 -0.60, 95% CI [-1.22, -0.05], p=0.03; random intercepts model; Fig. 2;Table 1).