*Values are no. (%) except as indicated. Percentages for fields with missing values are computed based on the full column value. For those with RSV, variables missing data were current/former smoker (n = 12), long-term care facility at admission (n = 2), COVID-19 vaccination status (n = 2), and discharged to long-term care facility (n = 6). For those with COVID-19, variables missing data were sex (n = 1), current/former smoker (n = 6), long-term care facility at admission (n = 4), COVID-19 vaccination status (n = 4), and discharged to long-term care facility (n = 1). IQR, interquartile range; RSV, respiratory syncytial virus. †Including nursing homes, assisted living homes, and rehabilitation hospital or other subacute or chronic facility. ‡Organ systems affected by chronic disease: cardiovascular disease, neurologic disease, pulmonary disease, gastrointestinal disease, endocrine disease, kidney disease, hematologic disease, autoimmune disease, and immunocompromising conditions. §Baseline physical functioning limitations are defined as receiving home care help or unable to walk. ¶Defined for those hospitalized before September 1, 2022, as completion of a primary series plus 1 or 2 monovalent (original) boosters and for those hospitalized after September 1, 2022, as receipt of >1 bivalent vaccine doses #Defined as any of the following events during the acute illness hospitalization: deep vein thrombosis, pulmonary embolism, myocardial infarction, stroke, high-flow nasal cannula oxygen, noninvasive or invasive mechanical ventilation, new tracheostomy, new renal replacement therapy, use of vasopressors, or extracorporeal membrane oxygenation. **Those hospitalized >28 d had length of stay truncated at 28 d.