Results
Of the 1272 women included in this study, 80.1% (n=1019) received
maternal pertussis vaccination. Vaccinated women had an average 0.22
weeks (95% CI 0.001, 0.44) longer gestation at delivery compared to
unvaccinated women. Maternal pertussis vaccination was not associated
with chorioamnionitis (aRR 0.71, 95% CI 0.27,1.82), gestational
hypertension (aHR 1.24, 95% CI, 0.66, 2.30), preeclampsia (aHR 0.75,
95% CI 0.47, 1.18) nor preterm birth (aHR 0.99, 95% CI 0.47, 2.07).
Neither risk of low birth weight (aHR 0.72, 95% CI 0.41, 1.27) nor
small for gestational age infants (aHR 0.67,95% CI 0.29, 1.55) were
increased following maternal pertussis vaccination. No associations
between pertussis vaccination during pregnancy and adverse birth
outcomes including admission to the neonatal care unit, low Apgar
scores, and mechanical ventilation were observed.