Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium longobardum 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 both in the dark and after light exposure. Mature
growth is obtained in solid media in 7-14 days incubation at temperatures between
25 and 37 ºC. No growth at 45 ºC. Variable growth on MacConkey agar without crystal
Isolated from sputum and other clinical samples in Italy and Lebanon.
Susceptible to sulfamethoxazole and clarithromycin. Resistant to thiophene carboxylic acid, tiacetazone, hydroxylamine, isoniazid,
quinolones, linezolid and streptomycin. Variable susceptibility to ethambutol.
Undetermined. One case of elbow osteomyelitis was reported.
- 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:
- Stephen Berger 2019. GIDEON Guide to Medically Important Bacteria, eBook.
Positive results for acid phophatase, arylsulfatase activity (3 days), thermostable catalase (68 ºC), catalase semiquantitative test, and
Negative results for niacin accumulation, beta-glucosidase, tellurite reduction and Tween 80 hydrolysis and urease.
Variable results for pyrazinamidase.
(c) Costin Stoica