Haemophilus influenzae type b vaccination and anthropometric, cognitive, and schooling outcomes among Indian children

Area of Science:

• Pediatrics
• Immunology
• Public Health

Background:

• Haemophilus influenzae type b (Hib) poses a significant health risk to Indian children, with 337,000 affected annually.
• The Hib vaccine was integrated into India's pentavalent vaccine schedule in 2011 and implemented nationwide.
• Understanding the long-term impact of Hib vaccination on child development is crucial for public health strategies.

Purpose of the Study:

• To investigate the association between Haemophilus influenzae type b (Hib) vaccination and anthropometric, cognitive, and schooling outcomes in Indian children.
• To assess the potential long-term benefits of Hib vaccination beyond immediate disease prevention.

Main Methods:

• Utilized longitudinal survey data from India, including 1824 children.
• Employed propensity score matching to mitigate bias from observed differences between vaccinated and unvaccinated groups.
• Analyzed height-for-age Z-scores (HAZ), BMI-for-age Z-scores (BMIZ), standardized test scores (English, mathematics, reading, Peabody Picture Vocabulary), and attained schooling grade.

Main Results:

• Hib-vaccinated children exhibited higher HAZ scores (0.25 at 11-12 years, 0.18 at 14-15 years).
• Vaccinated children achieved significantly higher scores in English (4.09 pp) and mathematics (4.78 pp) at 11-12 years, and in reading (3.63 pp) and mathematics (3.22 pp) at 14-15 years.
• Hib vaccination was associated with attainment of more schooling grades (0.16 at 11-12 years, 0.15 at 14-15 years).

Conclusions:

• The Haemophilus influenzae type b (Hib) vaccine demonstrates potential long-term benefits for child health, cognitive development, and educational success in India.
• These findings suggest that Hib vaccination contributes to improved overall child well-being.
• Further research may be needed to address potential unobserved confounding factors.