Respiratory syncytial virus (RSV) is a virus that causes infections in the lungs and respiratory tract. It is a contagious illness that spreads fast. The virus can spread through the air or direct contact, and it can enter the body through the eyes, nose or mouth.
RSV is very common in infants, but in most cases, the infection is not serious. If an infant gets infected, it is most contagious in the first 2-4 days.
Keywords: rsv infants contagious