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1 Laboratories di Microbiologia e Virologia, Ospedale di Careggi, 50139 Florence, Italy
2 Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, 38124 Braunschweig, Germany
3 Cattedra di Malattie Infettive, Università di Firenze, 50121 Florence, Italy
4 Dipartimento di Salute Pubblica e Biostatistica, Università di Pisa, 56127 Pisa, Italy
5 Laboratoire Central de Bactériologie, Hôpitaux Universitaires de Genève, 1211 Geneva, Switzerland
6 Station de Zoologie, Université de Genève, 1224 Chene-Bougeries, Switzerland
Author for correspondence: Enrico Tortoli. Tel: +39 055 4279199. Fax: +39 055 4279292. e-mail: tortoli{at}dada.it
ABSTRACT
A new, slow-growing, scotochromogenic mycobacterium was isolated from a lymph node of an immunocompromised child and subsequently from tap water and from a respiratory specimen of a patient with chronic fibrosis. Alcohol-acid-fastness, lipid patterns and the G+C content clearly support the placement of this organism in the genus Mycobacterium. The isolates grew very slowly at temperatures ranging from 25 to 32 °C and showed activities of nitrate reductase, catalase, urease, arylsulfatase and Tween 80 hydrolysis. The organism was susceptible to all antimycobacterial drugs tested. The 16S rDNA sequence was unique and phylogenetic analysis placed the organism close to fast-growing species such as Mycobacterium farcinogenes, Mycobacterium komossense and Mycobacterium aichiense. These data support the conclusion that the isolates represent a new mycobacterial species, for which the name Mycobacterium tusciae sp. nov. is proposed. The type strain is strain Fl-25796T; a culture of this strain has been deposited in the DSMZ as strain DSM 44338T.
Key Words: Mycobacterium tusciae sp. nov. • taxonomy • identification • phylogeny
The GenBank accession number for the 16S rDNA sequence of strain Fl25796T is AF058299.
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