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EDITORIAL COMMENT These studies confirm the view that there is an iron-deficiency state in ulcerative colitis and that this overshadows the influence of infection as a factor causing anaemia.The frequency of anaemia has been well established in the many reported series of patients with ulcerative colitis yet the aetiology of the anaemia is still not fully known. The purpose of this study is first to discover whether low haemoglobin levels are associated with any special features in the case reports of 479 patients (group A) and secondly to investigate an additional 28 ward patients (group B) to ascertain the parts played by iron deficiency, shortening of the red cell life, and lack of vitamin B12 or folic acid. METHODS

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