evidence of efficacy from well-conducted randomised controlled trials will become available to support its use, yet cystic fibrosis teams believe that prevention of RSV infection is intuitively a good policy, and a few have already organised local funding support under the umbrella of a ''chronic paediatric respiratory illness''.Engaging in RSV prophylaxis is a major undertaking for families of infants with cystic fibrosis, and our survey suggests that, given the current lack of an evidence base, only a minority of cystic fibrosis centres in the UK are advocating such a policy.