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1. (WO1997016730) METHOD OF DIAGNOSING CROHN'S DISEASE
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WHAT IS CLAIMED IS:

1. A method of diagnosing Crohn's disease in a patient in need of such diagnosis, wherein said method comprises detecting an immune response to S. mutans or an S. mutans antigen in a sample from said patient, and diagnosing said disease on the basis ofthe presence or absence of said response.

2 The method of claim 1, wherein said method detects S. mutans antibodies in said sample.

3. The method of claim 1, wherein said method detects S. mutans antigens in said sample.

4. The method of claim 1, wherein said method comprises measuring the effect of antigens of S. mutans upon proliferation in a sample of cells from said patient.

5. The method of any of claims 1-4, wherein said patient is an animal.

6. The method of any of claims 1-4, wherein said patient is a human.