We studied the taxonomic positions of the rapidly growing organism and phenotypically related organisms. We confirmed that “Mycobacterium peregrinum” ATCC 14467 (T = type strain) is genetically independent of M. fortuitum ATCC 6841 by using various DNA hybridization conditions. Strains that were genetically identified as “M. peregrinum” were phenotypically differentiated from M. fortuitum ATCC 6841. Thus, we propose that “M. peregrinum” should be revived as an independent species, Mycobacterium peregrinum sp. nov., nom. rev. The type strain is strain ATCC 14467. M. fortuitum subsp. acetamidolyticum ATCC 35931 exhibited a high level of DNA relatedness to M. fortuitum ATCC 6841 The hybridized DNAs maintained stable heteroduplexity at high stringency; thus, we confirmed that M. fortuitum subsp. acetamidolyticum is identical to M. fortuitum ATCC 6841 We found that A/, chelonae subsp. abscessus ATCC 19977 is genetically different from M. chelonae subsp. chelonae NCTC 946on the basis of the results of quantitative hybridization even under optimal conditions. There was no reason to maintain this organism as a subspecies of M. chelonae. Thus, we propose that M. chelonae subsp. abscessus should be elevated to species status as Mycobacterium abscessus (Kubica et al.) comb. nov. The type strain is strain ATCC 19977.


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