Clinical Risk Factors
Children born prematurely or with certain lung or heart problems have a greater risk of getting a more serious RSV infection. 1,2
In most children, RSV usually causes mild, cold-like symptoms. But for babies at risk, RSV may cause serious lung infections such as pneumonia and bronchiolitis, causing tiny airways in the lungs to swell and fill with mucus, making it hard to breathe. 1,3,4