A Study to Evaluate a Range of Dose Levels of an Adenovirus Serotype 26 (Ad26.RSV.preF)-Based Vaccine in Older Adults

Inclusion Criteria

• •In the investigator's clinical judgment, participants must be either in good or stable health. Participants may have underlying illnesses such as hypertension, type 2 diabetes mellitus, hyperlipoproteinemia, or hypothyroidism, as long as their signs and symptoms are stable and medically controlled in the judgment of the investigator. Participants will be included on the basis of medical history and of physical examination and vital signs performed at screening (all cohorts), and of physical examination and/or vital signs performed prevaccination on Day 1 (Cohorts 2 and 3)
• •A woman must be postmenopausal (defined as no menses for 12 months without an alternative medical cause) and not intending to conceive by any methods
• •Agree to not donate blood from the time of vaccination until 3 months after vaccination
• •Have a body mass index (BMI) less than (\<) 40 kilogram per meter square (kg/m\^2)
• •Be willing to provide verifiable identification and have means to be contacted and to contact the investigator during the study