Geometric mean pneumococcal polysaccharide antibody concentrations in vaccinated and control villages following vaccination with 1 dose of PCV-7 or serogroup C meningococcal conjugate vaccine (data from CSS1–CSS3 combined).

Due to similar kinetics in response to a single dose of PCV-7 at the three times points of assessment, data from CSS1 to CSS3 were combined to increase study power. The ratio of the GM in the vaccinated and control communities are derived and adjusted for the baseline values (†).‡indicate the p-values for test for a difference in the effect of vaccine in the two age groups (interaction).