Relationship between <i>Mycobacterium</i> and <i>Nocardia</i>

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  • Relationship between Mycobacterium and Nocardia

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Numerical classification was carried out using a "ghypothetical mean organism"h and11 species of the genus Mycobacterium and 6 species of the genus Nocardia. Statisticalsurvey of the results indicated the presence of three taxonomic groups, the slowlygrowing mycobacteria, the rapidly growing mycobacteria and nocardiae. The presentauthor had previously divided the genus Mycobacterirum into two subgenera, Mycobacteriumand Rlycomycobacterium, which corresponded approximately to slowlygrowing mycobacteria and rapidly growing mycobacteria, respectively. In the numericalclassification, these two subgenera behaved as if they were two genera. It was suggestedthus that these two subgenera of genus Mycobacterium should be transferred to twogenera. Beside morphological characters, three biochemical characters were shown to beuseful for differentiating between rapidly growing mycobacteria and nocardiae: (I) Atwo-week arylsulfatase activity; (2) Acid formation from mannose; (3) Utilization forgrowth of trimethylene diamine as a simultaneous nitrogen and carbon source.

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