Did you know that almost all kids are infected with respiratory syncytial virus (RSV) at least once by the time they’re 2 years old? And that RSV infections often occur in epidemics that last from late fall through early spring? RSV usually lasts about a week, but some cases may last several weeks, it causes infection of the lungs and breathing passages and is a major cause of respiratory illness in young children such as bronchitis and pneumonia. The challenge with preventin