LIVERPOOL, UK 19 October 2007: Scientists have found that a large proportion of infants who suffer from bronchiolitis have an inherent pre-disposition to the disease.
The disease is the most prevalent acute wheezing disorder in infants and is the most common cause of admission to hospital in the first year of life in the developed world. Around 25 in every 1,000 babies are admitted to hospital for bronchiolitis - needing oxygen and help with feeding - and of these, 10% need the support of a ventilator.
Bronchiolitis frequently develops in infants suffering from respiratory syncytial virus (RSV) infection. Although most infants infected with RSV have only mild symptoms such as a cough and wheeze some develop potentially life-threatening bronchiolitis. Babies born prematurely are particularly susceptible to the condition but what has puzzled scientists is that the majority of babies admitted to hospital are previously healthy and have not had an obvious reason for becoming so ill.
A new study by University of Liverpool scientists, based at Alder Hey Childrens Hospital, has found that previously healthy babies with severe disease have a different immune response to those with only mild symptoms. The study involved nearly 200 infants under two years old admitted to Alder Hey over a five-year period. On admission to hospital, those with severe disease were taking more than 50 breaths per minute and their blood oxygen levels were dangerously low.
The study found that those with severe bronchiolitis had lower levels of interferon-gamma and substance P in their airway secretions. Gamma interferon is an important substance made in the body which is used to fight viral infections. The role of substance P is less understood but is thought to be involved in the local inflammatory response in many parts of the body.
Dr Calum Semple, Senior Lecturer in Child Health at the University of Liverpool and Consultant Respiratory P
|Contact: Kate Spark|
University of Liverpool