Synagis is indicated for the prevention of serious lower-respiratory-tract disease requiring hospitalisation caused by respiratory syncytial virus (RSV) in children at high risk for RSV disease: children born at 35 weeks of gestation or less and less than six months of age at the onset of the RSV season; children less than two years of age and requiring treatment for bronchopulmonary dysplasia within the last six months; children less than two years of age and with haemodynamically significant congenital heart disease.