A Study of an Ad26.RSV.PreF-based Regimen at the End of Shelf-life in Adults Aged 60 to 75 Years

Inclusion Criteria: * Before randomization, a participant must be: a) postmenopausal (postmenopausal state is defined as no menses for 12 months without an alternative medical cause); and b) not intending to conceive by any methods * From the time of vaccination through 3 months after vaccination, agrees not to donate blood * In the investigator's clinical judgment, a participant must be in stable health at the time of vaccination. Participants may have underlying illnesses such as hypertension, congestive heart failure, chronic obstructive pulmonary disease, Type 2 diabetes, hyperlipoproteinemia, or hypothyroidism, as long as their symptoms and signs are stable at the time of vaccination, and these conditions receive routine follow-up by the participant's healthcare provider. Participants will be included on the basis of medical history and vital signs performed between informed consent form (ICF) signature and vaccination * Must be able to read, understand, and complete questionnaires in the electronic diary (eDiary) * Must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study * Must be able to work with smartphones/tablets/computers Exclusion Criteria: * Known or suspected allergy or history of anaphylaxis or other serious adverse reactions to vaccines or their excipients (including specifically the excipients of the study vaccine) * Abnormal function of the immune system resulting from clinical condi…