<unk>  is a slow-growing species of Mycobacterium. It is an ungrouped member of the third Runyon (nonchromatogenic mycobacteria). It is known to cause serious skin infections, which are "relatively resistant to antibiotic therapy".
Mycobacterium terrae
Mycobacterium xenopi
Mycobacterium szulgai
Mycobacterium abscessus
Mycobacterium chelonae
Mycobacterium immunogenum
Mycobacterium malmoense
Mycobacterium marinum