['healthy']
['placebo']

        Inclusion Criteria:

          -  Each participant must sign an Informed Consent Form (ICF) indicating that he or she
             understands the purpose of and procedures required for the study, is willing to
             participate in the study and attend all scheduled visits, is willing to be isolated
             and stay in the clinic for the quarantine phase, and is willing and able to comply
             with all study procedures and adhere to the prohibitions and restrictions specified in
             this protocol

          -  Participants must be in good health, without significant medical illness, on the basis
             of a medical evaluation that reveals the absence of any clinically relevant
             abnormality and includes a physical examination (including height and weight), skin
             examination, medical history, vital signs (systolic and diastolic blood pressure and
             heart rate, respiratory rate, and body temperature), and the results of clinical
             laboratory tests performed within 56 days of vaccination. If there are abnormalities,
             the participant may be included only if the investigator judges the abnormalities or
             deviations from normal to be not clinically significant. This determination must be
             recorded in the participant's source documents and initialed by the investigator

          -  Participants must have a non-clinically significant 12-lead electrocardiogram (ECG)
             within 56 days of vaccination including: normal sinus rhythm (heart rate between 50
             and 100 beats per minute [bpm], extremes included); QT interval corrected for heart
             rate according to Fridericia (QTcF) interval less than or equal to (<=) 450
             millisecond (ms); QT interval corrected for heart rate according to Bazett (QTcB)
             interval <= 450 ms; QRS interval less than (<) 120 ms; PR interval <= 210 ms

          -  Participants must be sero-suitable for respiratory syncytial virus (RSV) within 90
             days of vaccination (low immunity to the RSV-A Memphis 37b virus using a virus
             neutralization assay

          -  Participant must be healthy on the basis of clinical laboratory tests performed within
             56 days of vaccination. If the results of the laboratory screening tests are outside
             the local laboratory normal reference ranges and additionally within the limits of
             toxicity Grade 1 according to the US Food and Drug Administration (FDA) toxicity
             tables (that is, for tests in the FDA table), the participant may be included only if
             the investigator judges the abnormalities or deviations from normal to be not
             clinically significant and appropriate and reasonable for the population under study.
             This determination must be recorded in the participant's source documents and
             initialed by the investigator

        Exclusion Criteria:

          -  Participant has acute illness (this does not include minor illnesses such as diarrhea)
             or temperature greater than or equal to (>=) 37.8 degree Centigrade within 24 hours
             prior to study vaccination

          -  Participant has history of malignancy (exceptions are basal cell carcinomas of the
             skin treated over 5 years prior to vaccination considered cured with minimal risk of
             recurrence)

          -  Participant has chronic active hepatitis B or hepatitis C infection, documented by
             hepatitis B surface antigen and hepatitis C antibody, respectively

        Viral Challenge Exclusion Criteria:

          -  Participants having donated or lost more than 1 unit of blood (470 milliliter [mL])
             within 60 days or more than one unit of plasma within 7 days

          -  Participants with active acute respiratory infection
      