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Pneumococcal polysaccharide immunization in infants and children
Insights
Infants showed antibody responses to pneumococcal vaccine by 2 years, with significant responses to most types by 6-8 months. Type 3 responded early, while type 19 showed no significant response.
Area of Science:
- Immunology
- Pediatrics
- Vaccinology
Background:
- Pneumococcal polysaccharide vaccines are crucial for preventing invasive pneumococcal disease.
- Understanding infant antibody responses to pneumococcal vaccines is essential for optimizing immunization schedules.
Purpose of the Study:
- To evaluate antibody responses in infants and children to an octavalent pneumococcal polysaccharide vaccine.
- To determine the age-related antibody response to specific pneumococcal serotypes.
Main Methods:
- Indirect hemagglutination assay used to measure antibody titers.
- Study involved normal infants and children receiving an octavalent pneumococcal vaccine.
Main Results:
- Significant rise in antibody titers to most pneumococcal polysaccharide types by 2 years of age.
- By 6-8 months, 60% of infants responded to five of the eight vaccine types.
- Type 3 elicited an early response (3 months), while type 19 showed no significant response.
Conclusions:
- Recommended immunization at 6 months with a booster at 2 years, particularly for high-risk children.
- Antibody response to pneumococcal polysaccharides is age-dependent, similar to other polysaccharide vaccines.
Abstract:
By using indirect hemagglutination, the antibody responses of normal infants and children to an octavalent pneumococcal vaccine that contained pneumococcal polysaccharide types 1, 3, 6, 7, 14, 18, 19, and 23 were evaluated. By 2 years of age, there was a significant rise in hemagglutination titers to all the polysaccharide types, except type 19. By 6 to 8 months of age, five of the eight types of pneumococcal polysaccharides tested resulted in up to 60% responders and, by 2 years, a significant number responded to all pneumococcal polysaccharide types in the vaccine. Pneumococcal polysaccharide type 3 resulted in a significant antibody response as early as 3 months of age, whereas type 19 never resulted in a significant antibody response. Except for type 3, it seemed that when the other pneumococcal polysaccharides tested produced an antibody response, the degree of resonse did not subsequently change significantly with increasing age. The relationship of antibody response to age for pneumococcal polysaccharides is similar to that found for other polysaccharide vaccines. Based on the results of our study, we would recommend immunization with pneumococcal vaccine at 6 months of age with repeat immunization at 2 years of age, especially in high-risk children.