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Journal of Clinical Microbiology, Dec 1997, 3203-3209, Vol 35, No. 12
WH Haas, WR Butler, P Kirschner, BB Plikaytis, MB Coyle, B Amthor, AG Steigerwalt, DJ Brenner, M Salfinger, JT Crawford, EC Bottger and HJ Bremer
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.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
A new agent of mycobacterial lymphadenitis in children: Mycobacterium heidelbergense sp. nov [In Process Citation]
Department of General Pediatrics, Children's Hospital, Heidelberg University, Germany. ic1@ix.urz.uni-heidelberg.de
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