Kveim tests were done in forty-eight patients with Crohn's disease. Of forty-five with definite or probable Crohn's disease, twenty-three had a positive Kveim test. This finding could be explained:
(1) By cross-reactivity between sarcoidosis and Crohn's disease antigens;
(2) By an aetiological agent common to the two diseases, or
(3) By a property of the Kveim test material used in testing.
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