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Aims/hypothesis. We tested the hypothesis that silent coeliac disease is more frequent than expected in both patients with Type I (insulin-dependent) diabetes mellitus and their first-degree relatives. We evaluated how the presence of other autoimmune disorders in diabetic patients and their first-degree relatives is related to silent, unrecognized coeliac disease. Methods. Sera from 491 subjects with Type I diabetes, 824 relatives and 4000 healthy control subjects were screened for anti-endomysial antibodies and all those subjects who tested positive for anti-endomysial antibodies underwent intestinal biopsy. Results. We found that the prevalence of coeliac disease was 5.7 % among the diabetic patients and 1.9 % among the relatives, values significantly higher than those found among the control subjects (p < 0.0001; p < 0.001). The prevalence of autoimmune disorders in diabetic patients with …