Mycobacterium neoaurum
Cultural characteristics
Biochemical characters
Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium neoaurum Tsukamura 1972.
Acid-fast, intermediate to long rods. No cross-baring.  No cords formation. No mycelia
Colonies are scotochromogenic - golden yellow pigmented and visible after
incubation for less than 5 days on inspissated egg media. The temperature range for
growth is 25-37 ºC; does not grow at 45 or 52 ºC. Growth at 42 ºC is usually negative.
No growth on MacConkey agar w/o crystal violet. Can grow on media supplemented
with 5% NaCl.
Isolated from soil. Susceptible to hydroxylamine (500 μg/ml). Resistant to ethambutol (5 μg/ml), thiophene-2-carboxylic acid hydrazide
(1 μg/ml), isoniazid (1 μg/ml) and rifampicin (25 μg/ml).
Considered to be non-pathogenic.
  1. John G. Magee and Alan C. Ward 2012. Family III. Mycobacteriaceae Chester 1897, 63AL in Bergey’s Manual of Systematic
    Bacteriology, Volume Five The Actinobacteria, Part A, Michael Goodfellow & al. (editors), 312-375.
  2. Tsukamura M, Yano I, Imaeda T. Mycobacterium fortuitum subspecies acetamidolyticum, a new subspecies of Mycobacterium
    fortuitum. Microbiol Immunol 1986; 30:97-110.
  3. Schroder KH, Naumann L, Kroppenstedt RM, Reischl U. Mycobacterium hassiacum sp. nov., a new rapidly growing thermophilic
    mycobacterium. Int J Syst Bacteriol 1997; 47:86-91.
  4. Tsukamura M, Mizuno S, Tsukamura S. Numerical analysis of rapidly growing, scotochromogenic mycobacteria, including
    Mycobacterium obuense sp. nov., nom. rev., Mycobacterium rhodesiae sp. nov., nom. rev., Mycobacterium aichiense sp. nov.,
    nom. rev., Mycobacterium chubuense sp. nov., nom. rev., and Mycobacterium tokaiense sp. nov., nom. rev. Int. J. Syst. Bacteriol.
    1981; 31:263-275.
  5. Tsukamura M, Van Der Meulen HJ, Grabow WOK. Numerical taxonomy of rapidly growing, scotochromogenic mycobacteria of the
    Mycobacterium parafortuitum complex: Mycobacterium austroafricanum sp. nov. and Mycobacterium diernhoferi sp. nov., nom.
    rev. Int. J. Syst. Bacteriol. 1983; 33:460-469.
  6. Stanford JL, Gunthorpe WJ. A study of some fast-growing scotochromogenic mycobacteria including species descriptions of
    Mycobacterium gilvum (new species) and Mycobacterium duvalii (new species). Br J Exp Pathol 1971; 52:627-637.
  7. Willumsen P, Karlson U, Stackebrandt E, Kroppenstedt RM. Mycobacterium frederiksbergense sp. nov., a novel polycyclic
    aromatic hydrocarbon-degrading Mycobacterium species. Int J Syst Evol Microbiol 2001; 51:1715-1722.
  8. Vuorio R, Andersson MA, Rainey FA, Kroppenstedt RM, Kampfer P, Busse HJ, Viljanen M, Salkinoja-Salonen M. A new rapidly
    growing mycobacterial species, Mycobacterium murale sp. nov., isolated from the indoor walls of a children's day care centre. Int
    J Syst Bacteriol 1999; 49:25-35.
Positive results for allantoinase (most strains), iron uptake, nicotinamidase, pyrazinamidase,Tween 80 hydrolysis (contradictory
reports), and  urease.
Can utilize as sole carbon source arabinose, glucose, fructose, acetate, citrate, malate, fumarate, succinate, propanol, ethanol,
pyruvate, mannitol, xylose, and inositol.

Negative results for acid phosphatase, arylsulfatase (3 days), semiquantitative catalase test (most strains), beta-galactosidase (most
strains), benzamidase, isonicotinamidase, succinamidase, and niacin accumulation.
No utilization of benzoate, sucrose, and sorbitol.

Variable results for acetamidase, arylsulfatase (14 days), alpha- and beta-esterase, nitrate reduction, utilization of galactose,
malonate, rhamnose, and trehalose.
(c) Costin Stoica
Culture media
Biochemical tests
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