
What is Respiratory Syncytial Virus?
Respiratory Syncytial Virus (RSV) is the most common cause of lower respiratory tract infections in young children under 1 year old. What is RSV? Respiratory Syncytial Virus (RSV) is a common virus that causes respiratory infections in young children. In most healthy children, it causes an infection just like the common cold. Symptoms of the common cold in babies include: