The purpose of this study for: Cohort 1 and Cohort 2: to assess the safety and reactogenicity of the intramuscular one- and two-dose regimens, with a booster at Month 12 (Cohort 1) and to select a regimen for Cohort 3. Cohort 2 and part of Cohort 1: to assess respiratory syncytial virus (RSV) neutralizing antibody levels of the regimens containing RSV pre-fusion (preF) protein compared to the one-dose adenovirus serotype 26 respiratory syncytial virus pre-fusion (Ad26.RSV.preF) regimen. Cohort 3: to assess the safety and reactogenicity of the selected regimen and a booster at Month 12 and/or Month 24.
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Cohort 1: Number of Participants With Serious Adverse Events (SAEs)
Timeframe: From Day 1 up to Day 730
Cohort 2 (Groups 11-13 and 16-18): Number of Participants With Serious Adverse Events (SAEs)
Timeframe: From Day 1 up to Day 730
Cohort 2 (Groups 14-15): Number of Participants With Serious Adverse Events (SAEs)
Timeframe: From Day 1 up to Day 1095
Cohort 3: Number of Participants With Serious Adverse Events (SAEs)
Timeframe: From Day 1 up to Day 1095
Cohort 1: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 1
Timeframe: 7 days post-vaccination 1 on Day 1 (Day 8)
Cohort 1: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 2
Timeframe: 7 days post-vaccination 2 on Day 57 (Day 64)
Cohort 1: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 3
Timeframe: 7 days post-vaccination 3 on Day 365 (Day 372)
Cohort 2: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 1
Timeframe: 7 days post-vaccination 1 on Day 1 (Day 8)
Cohort 2: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 2
Timeframe: 7 days post-vaccination 2 on Day 57 (Day 64)
Cohort 3: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 1
Timeframe: 7 days post-vaccination 1 on Day 1 (Day 8)
Cohort 3: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 2
Timeframe: 7 days post-vaccination 2 on Day 365 (Day 372)
Cohort 3: Number of Participants With Solicited Local (Injection Site) and Systemic AEs at 7 Days Post-vaccination 3
Timeframe: 7 days post-vaccination 3 on Day 730 (Day 737)
Cohort 1: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 1
Timeframe: 28 days post-vaccination 1 on Day 1 (Day 29)
Cohort 1: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 2
Timeframe: 28 days post-vaccination 2 on Day 57 (Day 85)
Cohort 1: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 3
Timeframe: 28 days post-vaccination 3 on Day 365 (Day 393)
Cohort 2: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 1
Timeframe: 28 days post-vaccination 1 on Day 1 (Day 29)
Cohort 2: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 2
Timeframe: 28 days post-vaccination 2 on Day 57 (Day 85)
Cohort 3: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 1
Timeframe: 28 days post-vaccination 1 on Day 1 (Day 29)
Cohort 3: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 2
Timeframe: 28 days post-vaccination 2 on Day 365 (Day 393)
Cohort 3: Number of Participants With Unsolicited AEs at 28 Days Post-vaccination 3
Timeframe: 28 days post-vaccination 3 on Day 730 (Day 758)
Cohort 2 (Group 11 to 15): Respiratory Syncytial Virus (RSV) A2 Strain Neutralization Antibody Titers on Day 29
Timeframe: Day 29