Functional Impact of Acute Respiratory Viral Infections in Older Adults

Inclusion Criteria: * Male or female subjects aged 60 years or older * Hospitalized in a study center (emergency department, infectious disease, internal medicine or geriatric hospital wards…) for acute respiratory infection (refer to table 1 below for definition). * Confirmed positive PCR test for influenza, SARS-CoV-2, RSV, or human metapneumovirus (hMPV). Participants with co-infections with other viral or bacterial agents can be included. Exclusion Criteria: * Participants with conditions significantly impacting short-term functional status, such as severe disability (ADL score ≤2 or Clinical Frailty Scale ≥7), terminal illness, palliative care needs, or inability to comprehend and complete study questionnaires due to severe stroke sequelae, complete sensory loss, advanced dementia, or similar impairments. * Participants that refuse or are unable to answer the 3- and 6-months follow-up phone call assessments * Positive laboratory test for single (mono-infection) virus other than influenza, SARS-CoV-2, RSV, or human metapneumovirus (HMPV) * Participant in exclusion period for another study using an investigational / unapproved medicinal product. * Participant referred to in articles L1121-5 to L1121-8 of the CSP (corresponding to all protected persons : pregnant woman, parturient, breastfeeding mother, person deprived of liberty by judicial or administrative decision, persons undergoing psychiatric care under articles L.3212-1 and L.3213-1 who do not fall under article L.1121-8, persons admitted to a healthcare or social institution for purposes other than research, minors, person under legal protection or unable to express consent). * Individuals opposed to participating in the research * Staff members with a hierarchical relationship to the principal investigator