Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium engbaekii Tortoli et al. 2013.
Member of the Mycobacterium terrae complex.
Acid-fast rods, with some coccoid forms. No production of branches, aerial hyphae or
Colonies are rough and unpigmented in the dark but develop a pink pigmentation
after exposure to light. Mature growth is obtained in solid media in less than 10 days
incubation at temperatures between 25 and 37 ºC. Variable growth at 45 ºC.
Does not grow on MacConkey agar without crystal violet.
Isolated from various human clinical samples in Italy and Guadeloupe. Isolated from water in Denmark.
Susceptible to amikacin, clarithromycin, ethambutol, linezolid and rifabutin. Resistant to thiophene carboxylic acid, tiacetazone,
isoniazid, sulfamethoxazole and doxycycline.
- Tortoli E, Gitti Z, Klenk HP, Lauria S, Mannino R, Mantegani P, Mariottini A, Neonakis I. Survey of 150 strains belonging to the
Mycobacterium terrae complex and description of Mycobacterium engbaekii sp. nov., Mycobacterium heraklionense sp. nov. and
Mycobacterium longobardum sp. nov. Int J Syst Evol Microbiol 2013; 63:401-411.
- Tortoli E. Microbiological Features and Clinical Relevance of New Species of the Genus Mycobacterium. Clinical Microbiology
Reviews Oct 2014, 27 (4) 727-752; DOI: 10.1128/CMR.00035-14.
- Jamal Saad, Michael Phelippeau, May Khoder, Marc Levy, Didier Musso & Michel Drancourt. “Mycobacterium mephinesia”, a
Mycobacterium terrae complex species of clinical interest isolated in French Polynesia. Scientific Reports | (2019) 9:11169 | https:
Positive results for thermostable catalase (68 ºC), catalase semiquantitative test, beta-glucosidase, tellurite reduction and Tween 80
Negative results for niacin accumulation, arylsulfatase activity (3 days), nitrate reduction, and urease.
(c) Costin Stoica