Natural history of pertussis antibody in the infant and effect on vaccine response

Area of Science:

• Immunology
• Vaccinology
• Maternal-fetal medicine

Background:

• Understanding transplacental antibody transfer is crucial for infant immunity.
• Pertussis (whooping cough) antibody persistence and maternal influence on infant response require characterization.
• Evaluating vaccine efficacy in infants necessitates understanding maternal antibody interference.

Purpose of the Study:

• To characterize the transplacental transfer and persistence of pertussis antibodies.
• To investigate the role of maternal pertussis antibodies in infant immune response to vaccination.
• To compare the immunogenicity of conventional versus acellular pertussis vaccines in infants.

Main Methods:

• Serum concentrations of pertussis agglutinins, antibodies to lymphocytosis promoting factor (LPF), and filamentous hemagglutinin (FHA) were measured.
• Three distinct serum groups (maternal, newborn, infant) were analyzed.
• Antibody decline (half-life) and response to different vaccine types were assessed.

Main Results:

• Newborn pertussis IgG antibody levels mirrored maternal levels, with a half-life of approximately 6 weeks.
• Infants typically lacked detectable LPF or FHA antibodies by 4 months of age.
• Higher maternal LPF antibody concentrations correlated with a weaker infant response to conventional vaccines.
• Acellular pertussis vaccines elicited superior antibody production, irrespective of maternal LPF antibody levels.

Conclusions:

• Current pertussis immunization schedules are supported by these findings.
• Development of acellular pertussis vaccines for young infants is recommended.
• Maternal antibodies influence infant vaccine response, highlighting the need for effective vaccine strategies.