RSV (Respiratory Syncytial Virus)
Respiratory syncytial virus (RSV) is the most important cause of pneumonia and bronchiolitis in infants and small children. RSV causes a wide variety of symptoms, ranging from very mild to life threatening. The type and severity of symptoms depend on multiple factors, including the particular strain of the virus and whether the patient has other underlying medical problems. RSV is transmitted from an infected child by secretions from the nose or mouth of an infected person, by direct contact, or airborne droplets.