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| Item | Definition |
|---|---|
| Population of interest | Adults aged 60 years or older having received at least one dose of any respiratory syncytial virus vaccine |
| Exposure | Exposed to RSV infection during the subsequent RSV season |
| Control/comparator | Adults aged 60 years or older not vaccinated against respiratory syncytial virus (placebo) |
| Outcome | Occurrence of lower respiratory tract disease and/or acute respiratory infection |
