In a study of immunization in the Philippines, children vaccinated against 6 diseases performed significantly better on verbal reasoning, math, and language tests than those who were unvaccinated. (note: Researchers did not find an association with physical growth.)
Cognition & Schooling
Measles vaccination increased school attainment in South Africa
For every 6 children vaccinated against measles in a poor, largely rural community in South Africa, one additional grade of schooling was achieved.
Diarrhea and respiratory infections are associated with physical stunting in children
A large longitudinal study in the Philippines found that children suffering bouts of diarrhea and respiratory infections were at a significantly increased risk of physical stunting which is associated with “poor functional outcomes such as impaired cognitive development.”