Which of the following is not a pathogenic mycobacteria -: (A) M. kansasii, (B) M. scrofulaceum, (C) M. chelonae, (D) M. smegmatis
Answer is D. According to RUNYON classification atypical mycobacterium is classified under RAPID GROWERS which include M.chelonie, M.fouitum, M.smegmatis, M.abscess, M.phlei. Non pathogenic- M. smegmatis M. kansasii- Pulmonary disease resembling tuberculosis M. scrofulaceum- Cervical lymphadenitis M. chelonae- chronic abscess