Changes of tetanus specific IgG, IgM and IgG subclasses after DPT vaccination

Area of Science:

• Immunology
• Vaccinology

Background:

• Diphtheria-pertussis-tetanus (DPT) vaccination is crucial for pediatric immunity.
• Understanding the specific antibody responses post-vaccination is essential for assessing vaccine efficacy.

Purpose of the Study:

• To evaluate tetanus-specific IgG, IgM, and IgG subclass responses following DPT vaccination in infants and children.
• To characterize the antibody isotope profile against tetanus toxoid after DPT immunization.

Main Methods:

• Measurement of tetanus toxoid-specific IgG, IgM, and IgG subclasses.
• Comparison of antibody levels between vaccinated individuals and a control group.
• Analysis of IgG subclass distribution (IgG1, IgG4) in response to tetanus toxoid.

Main Results:

• Tetanus-specific IgG levels were significantly elevated in vaccinated individuals compared to controls.
• Antibody levels increased significantly after two DPT inoculations.
• IgG1 was the predominant subclass (80%), followed by IgG4 (45%), with both present in 30% of cases.
• Tetanus-specific IgG levels were low in adults and neonates.

Conclusions:

• Humoral immunity following DPT vaccination primarily involves IgG antibodies.
• IgG1 appears to be a key player among IgG subclasses in the tetanus toxoid immune response.
• IgG4, alone or with IgG1, also contributes to the immune response to tetanus toxoid.