A rapidly growing nontuberculous mycobacterium was isolated from diseased koi carp in Niigata, Japan, which was identified as representing a novel species through whole genome sequence analysis. The bacterial isolates (NGTWS0302, NGTWS1803 and NGTWSNA01) were found to belong to the genus through phylogenetic analysis using whole genome sequences of mycobacteria species. The bacterial colony was smooth, moist and non-chromogenic on 1% Ogawa medium at 30 °C. In biochemical characteristic tests, the bacterial isolates showed positive reactions for catalase activity, Tween 80 hydrolysis and tellurite reduction. The isolates were sensitive to 2-4 µg ml ampicillin, kanamycin and rifampicin. Based on these results, we propose a novel species, sp. nov. The type strain is NGTWS1803 (=JCM 35117=ATCC TSD-289).
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