1. PURPOSE: The Need for a Paediatric Trial of Steroids in Sepsis - potential benefits and risks Numerous targets for new therapies in sepsis have been identified, none of which have been shown to have been of benefit in children. The results of adult studies cannot therefore be extrapolated directly to childhood disease. Corticosteroids alter the inflammatory balance in both beneficial and harmful ways in severe sepsis. Recent adult studies have demonstrated transient adrenal insufficiency is associated with adverse outcome and that corticosteroids increase survival in specific patient groups, and steroid replacement has become a standard of care. There is little uniformity in the approach to steroid replacement therapy amongst leading paediatric centres in the UK. Expert opinion has emphasised that guidance is interim while awaiting appropriate paediatric studies. Steroids are perceived as "safe" and "cheap" but should not be introduced into paediatric practice without further research. Sepsis in childhood differs in terms of mortality (around 10% overall in children vs in excess of 40% in adults), background immunity, co−morbidity, and causative organisms. Given the lower overall mortality in childhood sepsis, steroids have the potential to disrupt the inflammatory balance in children causing greater harm than benefit. It is not known which patients should be targeted for therapeutic intervention; what are the most appropriate endpoints; whether the length of steroid therapy can be shorter in children; or whether immunological rebound will occur.