ARD can be claasified as '''idiopathic''' or '''secondary'''. In cases of idiopathic ARD, the only consistent finding is response and remission on antimicrobial therapy. In contrast, there is usually an underlying intestinal disease in cases of secondary ARD. This includes diseases causing: | ARD can be claasified as '''idiopathic''' or '''secondary'''. In cases of idiopathic ARD, the only consistent finding is response and remission on antimicrobial therapy. In contrast, there is usually an underlying intestinal disease in cases of secondary ARD. This includes diseases causing: |