Immunologic response to early and routine DTP immunization in infants

Area of Science:

• Immunology
• Pediatrics
• Vaccinology

Background:

• Pertussis (whooping cough) remains a public health concern, necessitating effective vaccination strategies.
• Infant immune responses to vaccines can be influenced by maternal antibodies and timing of administration.
• Assessing early immunization impacts on infant immunity is crucial for optimizing vaccine schedules.

Purpose of the Study:

• To investigate the effect of early immunization (in the newborn nursery) on subsequent immunity to Bordetella pertussis.
• To compare antibody titers to key pertussis antigens (filamentous hemagglutinin and lymphocytosis-promoting toxin) between early and routine immunization groups.
• To evaluate the influence of maternal antibodies on infant immune responses to pertussis vaccination.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to determine immunoglobulin (Ig) M and IgG antibody titers.
• Standard pertussis agglutinin titers were also measured.
• Antibody levels were assessed in cord blood and blood samples collected at 4, 6, and 9 months of age.

Main Results:

• Infants receiving early immunization showed significantly higher IgM anti-filamentous hemagglutinin titers at 4 and 6 months.
• No significant differences were observed in IgM anti-LPT, IgG anti-filamentous hemagglutinin, IgG anti-LPT, or pertussis agglutinin antibodies between groups.
• Infants with high cord IgG anti-LPT titers had lower responses to LPT later in infancy, irrespective of immunization timing.

Conclusions:

• Early immunization in the newborn period may enhance specific IgM responses to Bordetella pertussis components.
• Maternal antibodies can influence infant immune responses to pertussis antigens, potentially impacting vaccine efficacy.
• Further research is needed to optimize infant immunization schedules for robust and sustained pertussis protection.