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Mycobacterium genavense is a slow-growing species of the phylum actinobacteria (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus mycobacterium. ==Description== Nonmotile, acid-fast coccobacilli (1.0 µm x 2.0 µm). No formation of spores, capsules or aerial hyphae. Colony characteristics *Tiny, transparent, nonphotochromogenic and dysgonic colonies (on solid Middlebrook 7H11 medium MJ (Allied Laboratories). Physiology *Slow, fastidious growth in liquid media within 3–12 weeks at 31°C, 37°C and 42°C, with slightly better growth at 45°C. * Primary cultures for isolation require liquid broth media such as BACTEC 12B medium, Middlebrook 7H9 medium. *Acid broth media such as, BACTEC pyrazinamidase test medium, may facilitate primary isolation. *No growth on standard solid media like Löwenstein-Jensen, unsupplemented Middlebrook 7H11 or Middlebrook 7H10 media. *Visible growth on solid Middlebrook 7H11 medium supplemented with MJ after inoculation with a broth culture within 3–9 weeks. *Susceptible to streptomycin and rifampicin *Resistant to isoniazid and ethambutol Differential characteristics *Differentiation from other slowly growing mycobacteria by its fastidious growth. *Closely related to ''M. simiae'' by evaluation of 16S rDNA sequences. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mycobacterium genavense」の詳細全文を読む スポンサード リンク
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