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Editor,—We read with interest the report by Hullet al on chronic idiopathic bronchiolitis.1However, it is not totally correct to state that clinically, chronic bronchiolitis is a previously unreported respiratory entity. We have recognised the existence of this syndrome for many years and reported eight children with this condition in our percutaneous lung biopsy series.2 It is our impression that chronic bronchiolitis in infants is not a distinct entity, but rather a non-specific response of the small airways to a variety of different insults. In some children this condition is familial and may have an autoimmune component.3
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