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[Investigations on the immune response against meningococcal polysaccharide in children (author's transl)]
Insights
This study shows children immunized with meningococcal A + C vaccine developed a strong immune response. Younger children and those with lower initial antibody levels experienced greater increases in protection.
Area of Science:
- Immunology
- Vaccinology
- Pediatrics
Background:
- Meningococcal vaccines are crucial for preventing bacterial meningitis.
- Assessing immune response in pediatric populations is vital for vaccine efficacy.
Purpose of the Study:
- To evaluate the immunogenicity of a meningococcal A + C polysaccharide vaccine in children compared to adults.
- To analyze the correlation between age, prevaccinal antibody titers, and immune response.
Main Methods:
- Children aged 2-5 and 7-10 years were vaccinated with meningococcal A + C vaccine.
- Antibody levels were measured using a bactericidal microassay before and 4 weeks post-vaccination.
- Immune response was assessed by titer increase and conversion rates.
Main Results:
- All age groups demonstrated a significant immune response to both meningococcal A and C polysaccharides.
- Titer increases ranged from 4.5 to 9.3 steps, with conversion rates between 71% and 100%.
- Younger children and those with lower prevaccinal titers showed a more pronounced antibody response.
Conclusions:
- The meningococcal A + C vaccine is immunogenic across pediatric age groups.
- Age and baseline antibody levels influence the magnitude of the immune response to meningococcal vaccination.
Abstract:
Children between the 2nd and 5th, respectively between the 7th and 10th year were immunized with meningococcal vaccine A + C in comparison to adults. The vaccines contained 50 micrograms of meningococcal polysaccharide A and C and fulfilled the requirements of the WHO. Antibodies were determined before and 4 weeks after vaccination by means of the bactericidal microassay. All age groups showed a distinct immune response to polysaccharide A and polysaccharide C. The mean titer increase was between 4.5 and 9.3 titer steps, the conversion rate ranged from 71% to 100%. In the youngest age group a positive correlation between age and mean titer increase was found in prevaccinal seronegative children as well as in prevaccinal seropositve ones. In all age classes prevaccinal seronegative children showed a significant higher titer increase than prevaccinal seropositive ones. A negative correlation was found between prevaccinal titers and titer increase in all age groups with polysaccharide A and polysaccharide C.