This study is designed to analyze the impact of Respiratory Syncytial Virus (RSV) across different age groups. It focuses on how often RSV occurs, who is most at risk, and its long-term and financial effects. The study uses existing hospital records from SEHA facilities between January 2018 and December 2024. This is a retrospective observational study, meaning no new tests or treatments are given. Researchers look at medical records from past patients who were diagnosed with RSV. Anonymized data is collected from SEHA's Electronic Medical Records (EMR) and laboratory systems. Only patients with confirmed RSV infections are included.