TABLE 1.

Comparison of phenotypic characteristics of the novel isolates and related Mycobacterium species

Species or isolateGrowth ata:Test result
25°C30°C37°C42°CPigmentationbNiacinUreasePyrazinamidaseTween hydrolysis (10 day)Nitrate reductaseArylsulfatase (14 day)cCatalase at 68°CSemiquantitative catalase
Novel group
4773±++N++3++
283416+++N++2++
W55+++±N++1+++
W58+++±N++1+++
Va2+++±P++3++
M. simiae ++++P±+++++
M. genavense d ±+++N++++
M. lentiflavum ±++S±±±
M. triplex +++N+++4++
M. heidelbergense ++N+++1++
M. intermedium e ++++P+++++
M. interjectum ++N+++++
  • a +, positive; −, negative; ±, variable.

  • b P, photochromogenic; S, scotochromogenic; N, nonchromogenic.

  • c The 3-day arylsulfatase test was negative for all species tested in our laboratory

  • d Growth on solid media requires mycobactin J supplement and prolonged incubation for up to 60 days.

  • e Data are from reference 20.