Mycobacterium aichiense

Mycobacterium aichiense is a yellow-orange scotochromogenic, rapidly growing mycobacterium first isolated from soil and human sputum in Japan. It has not been formally associated with disease in humans.




  • Gram-positive, nonmotile and acid-fast rods less than 2 µm. Acid-fast in young cultures but may lose acid-fastness on prolonged culture.

Colony characteristics

  • Yellow-orange scotochromogenic colonies.


  • Grows at 25-37°C, not at 45°C, in 3–4 days or less
  • Acid phosphatase and arylsulfatase (3 days) is positive.
  • Negative for nitrate reduction, isonicotinamidase, and citrate utilisation.
  • Does not grow in the presence of hydroxylamine HCl (500 mg/l) and does not degrade PAS.


  • Not associated with disease.

Type strain

  • First isolated in Japan from soil and human sputum.
  • Strain 49005 (previously, strain 5545) = ATCC 27280 = CIP 106808 = DSM 44147 = JCM 6376 = LMG 19259 = NCTC 10820.


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