Correlation of Vaccine Responses.

Area of Science:

• Immunology
• Vaccinology
• Pediatric Research

Background:

• Humoral immune responses to vaccinations exhibit significant inter-individual variability.
• Limited data exists on the correlation of immune responses between different vaccine types.
• Understanding these correlations is crucial for optimizing infant immunization schedules.

Purpose of the Study:

• To investigate the correlation of antibody responses to routine vaccine antigens in infants.
• To determine if antibody responses to one vaccine can predict responses to others.

Main Methods:

• Antibody concentrations measured using multiplex immune-assays at multiple time points post-vaccination (6 and 12 months).
• Included antigens: diphtheria, tetanus, pertussis, polio, Hib, pneumococcus, meningococcus C, MMR.
• Spearman's rank correlation coefficients calculated to assess antibody response correlations.

Main Results:

• Strongest correlations observed between antibody responses to similar antigens (e.g., polio serotypes, pneumococcal serotypes) and antigens with shared carrier proteins (diphtheria-pneumococcal).
• Correlations between responses to tetanus, Hib, pertussis, and polio were weak.
• Antibody responses to 12-month vaccines showed weaker correlations than 6-month vaccines, with negative correlations between MMR and non-live vaccines.

Conclusions:

• Correlation of antibody responses is strong for similar antigens within a vaccine or those using shared carrier proteins.
• Weak correlations exist between responses to unrelated vaccine antigens.
• Antibody responses to one vaccine antigen are not a reliable surrogate marker for responses to unrelated vaccines.