The primary objectives of this study are to evaluate the safety and tolerability of the pneumococcal 21 valent conjugate vaccine (V116), and to evaluate the serotype-specific opsonophagocytic activity (OPA) post-vaccination with V116 and PCV15 (a pneumococcal conjugate vaccine that includes 15 serotypes) + PPSV23 (comprised of the polysaccharides from 23 of the serotypes causing disease in adults) post-vaccination within each vaccination group separately.
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Percentage of Participants With Solicited Injection-site Adverse Events (AEs) From Day 1 Through Day 5 Post-vaccination
Timeframe: Up to 5 days following each vaccination
Participants With Solicited Systemic AEs From Day 1 Through Day 5 Post-vaccination
Timeframe: Up to 5 days following each vaccination
Participants With Vaccine-related Serious Adverse Events (SAEs) From Day 1 Through The Duration of Participation in The Study
Timeframe: Up to 194 days following Visit 2 (Day 1)
Serotype-specific Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMTs) for Pneumococcal Serotypes Contained in V116
Timeframe: 30 days following V116 [Day 30] for the V116 + Placebo group and 30 days following PPSV23 [Week 12] for the PCV15 + PPSV23 group.