Six mycobacterial isolates from haemodialysis water, conforming a homogeneous phylogenetic group in a previous multigenic analysis, were classified taxonomically. Physiological and biochemical characterization, as well as DNA–DNA hybridizations, demonstrated that the isolates were facultatively autotrophic, aerobic and hydrogen-oxidizing bacteria, representing a novel species in the rapid growing group, for which the name sp. nov. is proposed. The type strain is MG13 (=CECT 7273=CCUG 54744).


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