This seasonal infection can be potentially deadly

A nasopharyngeal swab can accurately diagnose whether you have an RSV infection or influenza. — Bloomberg

Respiratory syncytial virus (RSV) is a common infection that affects the nose, throat and sometimes the lungs of young children and senior citizens.

Whilst the majority of RSV infections are usually mild with cold-like symptoms, they are unpredictable and can spread rapidly to the lower respiratory tract, causing lung infection (pneumonia) and/or infection of the small airway passages entering the lungs. (bronchiolitis)