Schuller J L, Piket-van Ulsen J, Veeken I V, Michel M F, Stolz E
Lancet. 1979 Jan 6;1(8106):19-20. doi: 10.1016/s0140-6736(79)90457-4.
Antibodies against Chlamydia of lymphogranuloma-venereum type were detected by the micro-immunofluorescence technique in 38 (69%) of 55 patients with Crohn's disease. Weak positive reactions were seen in only 2 or 21 patients with other gastrointestinal disorders and 1 of 50 healthy blood-donors.