Maternal Immunization Earlier in Pregnancy Maximizes Antibody Transfer and Expected Infant Seropositivity Against Pertussis

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
Christiane S EberhardtClaire-Anne Siegrist

Abstract

Maternal immunization against pertussis is currently recommended after the 26th gestational week (GW). Data on the optimal timing of maternal immunization are inconsistent. We conducted a prospective observational noninferiority study comparing the influence of second-trimester (GW 13-25) vs third-trimester (≥GW 26) tetanus-diphtheria-acellular pertussis (Tdap) immunization in pregnant women who delivered at term. Geometric mean concentrations (GMCs) of cord blood antibodies to recombinant pertussis toxin (PT) and filamentous hemagglutinin (FHA) were assessed by enzyme-linked immunosorbent assay. The primary endpoint were GMCs and expected infant seropositivity rates, defined by birth anti-PT >30 enzyme-linked immunosorbent assay units (EU)/mL to confer seropositivity until 3 months of age. We included 335 women (mean age, 31.0 ± 5.1 years; mean gestational age, 39.3 ± 1.3 GW) previously immunized with Tdap in the second (n = 122) or third (n = 213) trimester. Anti-PT and anti-FHA GMCs were higher following second- vs third-trimester immunization (PT: 57.1 EU/mL [95% confidence interval {CI}, 47.8-68.2] vs 31.1 EU/mL [95% CI, 25.7-37.7], P < .001; FHA: 284.4 EU/mL [95% CI, 241.3-335.2] vs 140.2 EU/mL [95% CI, 115.3-170.3], P < ...Continue Reading

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