A study on the immune response, safety and the occurrence of RSV-associated respiratory tract illness after administration of RSV OA vaccine in adults 60 years and older.

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• • History of any reaction or hypersensitivity likely to be exacerbated by any component of the study intervention(s) (For details on components of study intervention administered, refer to Table 9 and Arexvy [Summary of Product Characteristics, 2023; Prescribing Information, 2023]. EXC#1 • Any clinical conditions for which serum samples would be prohibited for transfer to local central lab for testing. These clinical conditions include hepatitis B, hepatitis C, HIV and Syphilis based on medical history and physical examination (all participants) and laboratory screening tests (overseas participants). EXC#2 • Any confirmed or suspected immunosuppressive or immunodeficient condition resulting from disease (e.g., current malignancy, human immunodeficiency virus) or immunosuppressive/cytotoxic therapy (e.g., medication used during cancer chemotherapy, organ transplantation, or to treat autoimmune disorders), based on medical history and physical examination (no laboratory testing required). EXC#3 • Any history of dementia or any medical condition that moderately or severely impairs cognition. EXC#4 • Recurrent history or uncontrolled neurological disorders or seizures. Participants with medically controlled active or chronic neurological diseases can be enrolled in the study as per investigator assessment, provided that their condition will allow them to comply with the requirements of the protocol (e.g. completion of the diary cards, attend regular phone calls/study site visits, perform self-swabbing (study participants in China only). EXC#5 • Significant underlying illness that in the opinion of the investigator would be expected to prevent completion of the study (e.g., life-threatening disease likely to limit survival to less than 1 year). EXC#6 • Serious or unstable chronic illness. EXC#7 • Any other clinical condition that, in the opinion of the investigator, might pose additional risk to the participant due to participation in the study. EXC#8 • Previous vaccination with RSV vaccine. EXC#9 • Use of any investigational or non-registered product (drug, vaccine or invasive medical device) other than the study intervention(s) during the period beginning 30 days before the dose of study intervention(s), or their planned use during the study period. EXC#10
• • Planned or actual administration of a vaccine not foreseen by the study protocol in the period starting 30 days before and ending 30 days after study intervention administration, with the exception of COVID-19 and inactivated/subunit influenza vaccines which can be administered up to 14 days before or from 14 days after each study intervention. EXC#11 Note: In case an emergency mass vaccination for an unforeseen public health threat (e.g.: a pandemic) is recommended and/or organized by the public health authorities, outside the routine immunization program, the time period described above can be reduced if necessary for that vaccine provided it is used according to the local governmental recommendations and that the Sponsor is notified accordingly. • Administration of long-acting immune-modifying drugs or planned administration at any time during the study period (e.g., infliximab). EXC#12 • Administration of immunoglobulins and/or any blood products or plasma derivatives during the period starting 90 days before the study intervention administration or planned administration during the study period. EXC#13 • Chronic administration (defined as more than 14 consecutive days in total) of immunosuppressants or other immune-modifying drugs during the period starting 90 days prior to the study intervention administration or planned administration during the study period. For corticosteroids, this will mean prednisone ≥20 mg/day, or equivalent. Inhaled and topical steroids are allowed. EXC#14 • Concurrently participating in another clinical study, at any time during the study period, in which the participant has been or will be exposed to an investigational or a non-investigational intervention (drug/invasive medical device). Refer to Definition of Terms for the definition of invasive medical device. EXC#15 • History of chronic alcohol consumption and/or drug abuse as deemed by the investigator to render the potential participant unable/unlikely to provide accurate safety reports or comply with study procedures. EXC#16 • Bedridden participants. EXC#17 • Planned move during the study conduct that prohibits participation until study end. EXC#18 • Participation of any study personnel or their immediate dependents, family, or household members. EXC#19