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Int J Syst Evol Microbiol. 2015 Dec;65(12):4724-9. doi: 10.1099/ijsem.0.000642. Epub 2015 Sep 28.

Mycobacterium angelicum sp. nov., a non-chromogenic, slow-growing species isolated from fish and related to Mycobacterium szulgai.

Author information

1​ School of Veterinary Medicine, Ilam University, Ilam, Iran.
2​ National Veterinary Institute, University of Ljubljana, Ljubljana, Slovenia.
3​ Emerging Bacterial Pathogens Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.
4​ Center for Translational Genomics and Bioinformatics, IRCCS San Raffaele Scientific Institute, Milan, Italy.
5​ Microbiology Unit, General Hospital, Bolzano-Bozen, Italy.
6​ Diagnostic Genetics Unit, Careggi University Hospital, Florence, Italy.
7​ Department of Microbiology and Immunology, Showa University, Tokyo, Japan.
8​ Mycrobiology and Virology Unit, Careggi University Hospital, Florence, Italy.


The name 'Mycobacterium angelicum' dates back to 2003 when it was suggested for a slowly growing mycobacterium isolated from freshwater angelfish. This name is revived here and the novel species is proposed on the basis of the polyphasic characterization of four strains including the original one. The four strains presented 100 % 16S rRNA gene sequence similarity with Mycobacterium szulgai but clearly differed from M. szulgai for the milky white aspect of the colonies. The sequence similarity with the type strain of M. szulgai ranged, in eight additionally investigated genetic targets, from 78.9 to 94.3 %, an evident contrast with the close relatedness that emerged at the level of 16S rRNA gene. The average nucleotide identity between the genomes of M. szulgai DSM 44166T and strain 126/5/03T (type strain of the novel species) was 92.92 %, and supported the status of independent species. The confirmation of the name Mycobacterium angelicum sp. nov. is proposed, with strain 126/5/03T ( = CIP 109313T = DSM 45057T) as the type strain.

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