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, 4 (4), 631-4

Mycobacterium Canettii, the Smooth Variant of M. Tuberculosis, Isolated From a Swiss Patient Exposed in Africa

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Mycobacterium Canettii, the Smooth Variant of M. Tuberculosis, Isolated From a Swiss Patient Exposed in Africa

G E Pfyffer et al. Emerg Infect Dis.

Abstract

An exceptionally smooth and glossy morphotype of Mycobacterium tuberculosis complex was isolated from a 56-year-old Swiss patient with mesenteric tuberculosis. Direct 16S rRNA sequence analysis of the hypervariable signature gene regions revealed a 100% homology to the specific M. tuberculosis complex sequence. Spoligotyping and restriction fragment length polymorphism analyses using the insertion sequences IS6110 and IS1081 and the polymorphic GC-rich sequence as additional genetic markers identified the isolate as the novel taxon M. canettii. Like a Somali child with a similar case, this patient probably contracted the infection in Africa, which raises questions about the geographic distribution of M. canettii.

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