Procedures
Intervention group participants received one of four PCV schedules: PCV10 at 12 months of age (0 + 1 PCV10), PCV13 at 12 months of age (0 + 1 PCV13), PCV10 at 2 months and 12 months of age (1 + 1 PCV10), or PCV13 at 2 months and 12 months of age (1 + 1 PCV13). Control group participants received a dose of PCV10 at the final study visit at 24 months of age. Additional details regarding vaccine administration have been described previously.Nasopharyngeal swabs were collected, stored, and tested consistent with WHO guidelines.