Abstract:
:Nontuberculous mycobacterial lymphadenitis presents an increasing clinical problem in immunocompetent young children. A slowly growing, nonphotochromogenic mycobacterium was recovered twice (isolates 2553/91 and 2554/91) from the lymphatic tissue of a child with recurrent cervical lymphadenitis. It could be differentiated biochemically from described Mycobacterium species, although it most closely resembled Mycobacterium malmoense by thin-layer chromatography and high-performance liquid chromatography of mycolic acids. A striking characteristic of the isolate was its high degree of susceptibility to antituberculous drugs in vitro, including isoniazid. Direct determination of the 16S rRNA gene sequence revealed a unique sequence and positioned the strain phylogenetically on a branch separate from M. malmoense within a group of slowly growing mycobacteria that show a high degree of similarity to M. simiae at the 16S rRNA gene level. Despite 99.6% sequence identity with M. simiae at the 16S rRNA gene level, DNA-DNA hybridization studies (hydroxyapatite method) demonstrated DNA relatedness of less than 40%. We conclude that this organism is a new species for which we propose the name M. heidelbergense. A culture of the type strain, strain 2554/91, has been deposited in the American Type Culture Collection as strain ATCC 51253.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Haas WH,Butler WR,Kirschner P,Plikaytis BB,Coyle MB,Amthor B,Steigerwalt AG,Brenner DJ,Salfinger M,Crawford JT,Böttger EC,Bremer HJdoi
10.1128/JCM.35.12.3203-3209.1997subject
Has Abstractpub_date
1997-12-01 00:00:00pages
3203-9issue
12eissn
0095-1137issn
1098-660Xjournal_volume
35pub_type
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