Mycobacterium arupense sp. nov., a non-chromogenic bacterium isolated from clinical specimens

Joann L. Cloud, Jay J. Meyer, June I. Pounder, Kenneth C. Jost, Amy Sweeney, Karen C. Carroll, Gail L. Woods

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Several Mycobacterium-like organisms related to the Mycobacterium terrae complex have been isolated from clinical samples. In the clinical microbiology laboratory, partial 16S rRNA gene sequencing (approximately the first 500 bp) rather than full 16S rRNA gene sequencing is often used to identify Mycobacterium species. Partial 16S rRNA gene sequence analysis revealed 100 % similarity between 65 clinical isolates and Mycobacterium sp. MCRO 6 (GenBank accession no. X93032). Even after sequencing the nearly full-length 16S rRNA gene, closest similarity was only 99.6 % to Mycobacterium nonchromogenicum ATCC 19530T. Sequencing of the nearly full-length 16S rRNA gene, the 16S-23S internal transcribed spacer region and the hsp65 gene did not reveal genotypic identity with the type strains of M. nonchromogenicum, M. terrae or Mycobacterium triviale. Although sequence analysis suggested that these clinical isolates represented a novel species, mycolic acid analysis by HPLC failed to distinguish them from M. nonchromogenicum. Therefore, phenotypic analysis including growth characterization, antibiotic susceptibility testing and biochemical testing was performed. These strains from clinical samples should be recognized as representing a novel species of the genus Mycobacterium, for which the name Mycobacterium arupense sp. nov. is proposed. The type strain is AR30097T (=ATCC BAA-1242T=DSM 44942T).

Original languageEnglish (US)
Pages (from-to)1413-1418
Number of pages6
JournalInternational Journal of Systematic and Evolutionary Microbiology
Issue number6
StatePublished - Jun 2006

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics


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