In 1977, 53 members of ESPGAN completed a questionnaire on their current practice in diagnosing coeliac disease. The usefulness of the 'Interlaken' criteria enumerated 9 years previously was reassessed. Details were obtained about the initial diagnostic approach, the acceptable histological criteria of the initial jejunal biopsy, and the timing, technique, response, and interpretation of early and late rechallenges with gluten. Answers indicated that, although the initial mucosal lesion is usually 'flat' at the time of diagnosis, a few infants may present at a time when the mucosal lesion is less completely damaged. Furthermore, the degree of histological change after gluten challenge that is acceptable as a positive response may vary according to the state of the mucosa before challenge. It was noted that there are still no generally agreed criteria by which the histological lesions may be described, so that (after further discussions at the Third International Coeliac Conference in Galway) a European panel has been set up to make recommendations. In the experience of ESPGAN members, most coeliac children will have a histological relapse within 2 years of reintroduction of gluten. But a small number of unorthodox cases were reported that suggest that (a) histological relapse may take longer than 2 years to appear, or (b) the degree of sensitivity to gluten may vary at different ages. Very long-term follow-up will be needed to explain these anomalies. Meanwhile the search continues for 'the basic defect'.
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