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The granulomatous disorders encompass a wide spectrum of common and rare afflictions that together impose a tremendous burden of disease. Common causes include infections such as tuberculosis and idiopathic disorders such as sarcoidosis and Crohn's disease. Undoubtedly, these latter disorders elicit interest in part because of their uncertain, but possibly infectious, origins. Over the past decade, use of the tools of molecular biology has led to major advances in our understanding of granulomatous disorders. However, the challenge remains for the clinician and scientist to understand the complex genetic, microbial, immunologic, and environmental factors that are responsible for the varied clinical
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