| Mycobacterium riyadhense |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium riyadhense van Ingen et al. 2009.
Species description is based on a single isolate.
Mycobacterium, Mycobacterium riyadhense van Ingen et al. 2009.
Species description is based on a single isolate.
Acid-fast rods.
Colonies are rough and white after 28 days of incubation at 36 ºC on Middlebrook
7H10, Ogawa and Stonebrink media; growth is slower at 25 and 30 ºC and no growth
occurs at 42 ºC. No growth on MacConkey agar, p-nitrobenzoic acid, hydroxylamine
and oleic acid.
7H10, Ogawa and Stonebrink media; growth is slower at 25 and 30 ºC and no growth
occurs at 42 ºC. No growth on MacConkey agar, p-nitrobenzoic acid, hydroxylamine
and oleic acid.
Isolated from maxillary sinus lavage fluid of 19-year-old male in Riyadh, Saudi Arabia.
Resistant to thiophene-2-carboxylic acid hydrazide (TCH), thiacetazone, amikacin (10 μg/ml) and p-aminosalicylate (1 μg/ml).
Intermediate to isoniazid (1 μg/ml). Susceptible to rifampicin (0.2 μg/ml), rifabutin (0.2 μg/ml), ethambutol (5 μg/ml), clarithromycin (2
μg/ml), ciprofloxacin (2 μg/ml), cycloserine (20 μg/ml), prothionamide (1 μg/ml), clofazimine (0.5 μg/ml) and streptomycin (5 μg/ml) and
hydroxylamine (1 μg/ml).
Resistant to thiophene-2-carboxylic acid hydrazide (TCH), thiacetazone, amikacin (10 μg/ml) and p-aminosalicylate (1 μg/ml).
Intermediate to isoniazid (1 μg/ml). Susceptible to rifampicin (0.2 μg/ml), rifabutin (0.2 μg/ml), ethambutol (5 μg/ml), clarithromycin (2
μg/ml), ciprofloxacin (2 μg/ml), cycloserine (20 μg/ml), prothionamide (1 μg/ml), clofazimine (0.5 μg/ml) and streptomycin (5 μg/ml) and
hydroxylamine (1 μg/ml).
Undetermined.
- Van Ingen J, Al-Hajoj SA, Boeree M, Al-Rabiah F, Enaimi M, de Zwaan R, Tortoli E, Dekhuijzen R, van Soolingen D. Mycobacterium
riyadhense sp. nov., a non-tuberculous species identified as Mycobacterium tuberculosis complex by a commercial line-probe
assay. Int J Syst Evol Microbiol 2009; 59:1049-1053.
Positive results for arylsulfatase (3 days), semiquantitative catalase test, nitrate reduction, Tween 80 hydrolysis, and urease.
Negative results for heat-stable catalase (68 ºC), niacin accumulation, beta-glucosidase, and tellurite reduction.
Negative results for heat-stable catalase (68 ºC), niacin accumulation, beta-glucosidase, and tellurite reduction.
(c) Costin Stoica
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