Hazard ratios for first acquisition of selected serotypes and serotype groups in infants from vaccinated and control villages in the main (post-vaccination) study. Comparisons of each arm with the earlier baseline study are also included.

*9 children in the vaccinated villages had serotype 7F isolates, all of these were in the post-vaccination survey. Hazard ratios comparing the hazards for first acquisition of pneumococci with those found in the pre-vaccination survey in each arm of the trial are also shown.