Longitudinal COVID-19 Vaccination Records and SARS-CoV-2 Infection Among Older Long-Term Care Facility Residents in Okinawa, Japan: A Retrospective Descriptive Study
Background Repeated COVID-19 vaccination is widely used in long-term care facilities, yet SARS-CoV-2 infection and reinfection continue to occur in frail older populations. Resident-level longitudinal data linking vaccination records with first and recurrent infections remain limited in Japanese long-term care settings...