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| Non-invasive |
| Stool: PCR, microscopy |
| Blood (serum): blood culture, CMV PCR and quantitative assay, immunosuppressive drug serum assays, immunological test for endomysial antibodies and transglutamase antibodies |
| Invasive |
| Biopsy: colonic, terminal ileum, gastric, duodenal |
CMV: cytomegalovirus.
