15 | Adherence to influenza vaccination in the geriatric population: a comparative analysis between hospitalized and community-dwelling older adults

M. Ceci¹, R. Rala², E. Del Giudice¹, A. Cavalli¹, U.G. Galasso², G. Desideri², L. Palleschi¹ | ¹Unit of Geriatrics, Medical Department, San Giovanni-Addolorata Hospital, Rome; ²Department of Internal Medicine and Medical Specialties, UOC Geriatrics, Sapienza University of Rome, Rome.

Introduction. Influenza vaccination is the main strategy to prevent seasonal influenza and reduce cardio-pulmonary complications, which are associated with increased mortality in frail older adults. The Italian National Immunization Plan recommends a minimum coverage of 75% and an optimal target of 95% for individuals aged ≥65 years and high-risk groups. However, vaccination coverage in Italy for the 2025–2026 season remains around 50%.

Objectives. To assess adherence to influenza vaccination among hospitalized older adults and compare it with that of community-dwelling older adults (Day Service).

Materials and Methods. A cross-sectional survey was conducted through direct interviews with patients and/or caregivers. All consecutive patients admitted to the Geriatrics ward or attending the Geriatric Day Service between February 15 and March 26, 2026 were included.

Results. A total of 86 patients were enrolled. In the inpatient group (n=62), 22 patients were vaccinated, 39 were unvaccinated, and 1 had uncertain vaccination status, resulting in a coverage rate of 35.5%. In the Day Service/Outpatient group (n=24), 22 patients were vaccinated, 1 was unvaccinated, and 1 had uncertain status, with a coverage rate of 91.6%.

Conclusions. A marked difference in vaccination coverage was observed between hospitalized and community-dwelling older adults. Coverage among inpatients was well below the recommended minimum target of 75%. This finding suggests the presence of significant barriers to vaccine access in the hospitalized geriatric population, including reduced mobility, difficulties in accessing primary care services, and frequent admissions during the vaccination period. Paradoxically, these frail patients are those who would benefit most from vaccination in terms of reduced mortality and cardio-pulmonary complications. Implementing in-hospital vaccination strategies for older adults may improve coverage, promote equitable access, and contribute to reducing the burden on healthcare systems.