alexa Culture of Mycobacterium avium subspecies paratuberculosis from the blood of patients with Crohn's disease.
Microbiology

Microbiology

Mycobacterial Diseases

Author(s): Naser SA, Ghobrial G, Romero C, Valentine JF

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Abstract BACKGROUND: Crohn's disease, a form of inflammatory bowel disease, resembles some aspects of tuberculosis, leprosy, and paratuberculosis. The role of Mycobacterium avium subspecies paratuberculosis (MAP) in Crohn's disease is controversial. METHODS: We tested for MAP by PCR and culture in buffy coat preparations from 28 individuals with Crohn's disease, nine with ulcerative colitis, and 15 without inflammatory bowel disease. FINDINGS: MAP DNA in uncultured buffy coats was identified by PCR in 13 (46\%) individuals with Crohn's disease, four (45\%) with ulcerative colitis, and three (20\%) without inflammatory bowel disease. Viable MAP was cultured from the blood of 14 (50\%) patients with Crohn's disease, two (22\%) with ulcerative colitis, and none of the individuals without inflammatory bowel disease. Current use of immunosuppressive medication did not correlate with a positive MAP culture. Sequencing of PCR products from MAP cultures confirmed the presence of the MAP-specific IS900 fragment. Among 11 MAP isolates assessed, we identified nine strains that were not identical. INTERPRETATION: We detected viable MAP in peripheral blood in a higher proportion of individuals with Crohn's disease than in controls. These data contribute to the evidence that MAP might be a cause of Crohn's disease. This article was published in Lancet and referenced in Mycobacterial Diseases

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