Antibody response to measles immunization in India

Area of Science:

• Immunology
• Vaccinology
• Pediatrics

Background:

• Measles remains a significant public health concern globally.
• Understanding optimal timing for measles vaccination is crucial for effective immunization programs.
• Previous studies suggest varying seroconversion rates based on age at vaccination.

Purpose of the Study:

• To evaluate the antibody response to measles vaccine in children aged 6-15 months in India.
• To assess the impact of age and nutritional status on measles vaccine immunogenicity.
• To provide evidence-based recommendations for measles immunization strategies in India.

Main Methods:

• A cohort study involving 238 subjects aged 6-15 months.
• Measurement of antibody response, including seroconversion rates and antibody titres.
• Comparison of immune responses between normal and malnourished children (Grades I and II).

Main Results:

• Seroconversion rates ranged from 74% at 6 months to 100% at 13-15 months, with no statistically significant age-related differences.
• Post-immunization antibody titres increased with the age of vaccination.
• No significant differences in seroconversion rates or antibody titres were found between malnourished and normal subjects.

Conclusions:

• The findings support the current recommendation of initiating measles immunization at 9 months in India.
• However, higher antibody levels and seroconversion rates were achieved in children vaccinated after 12 months of age.
• Further consideration of the optimal age for measles vaccination in the Indian context may be warranted to maximize immune response.