Virtually all children get an RSV infection by the time they are 2 years old. Most of the time RSV will cause a mild, cold-like illness, but it can also cause severe illness such as

• Bronchiolitis (inflammation of the small airways in the lung)
• Pneumonia (infection of the lungs)

One to two out of every 100 children younger than 6 months of age with RSV infection may need to be hospitalized. Those who are hospitalized may require oxygen, intubation, and/or mechanical ventilation (help with breathing). Most improve with this type of supportive care and are discharged in a few days.