Strains of a new species of rapidly growing, nonphotochromogenic mycobacteria, , were isolated from human sputum. The growth characteristics, acid fastness, and mycolic acids of the isolates were consistent with those of species. The isolates were identified as members of a new species by performing a biochemical analysis and DNA-DNA hybridization experiments, and by comparing the sequences of several conserved genes, such as the 16S rRNA, , and genes. A phylogenetic analysis in which 16S rRNA and sequences were used identified as a novel distinct species and placed between members of the complex and the thermotolerant rapidly growing group. Our results demonstrate that the taxonomic value of sequence analysis in the genus is similar to the well-established value of 16S rRNA sequence analysis.


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