Abstract
On the basis of a study of the effect of trimethoprim on the growth of 131 rapidly growing mycobacteria identified at the species level, it was found that 2 of the stains were possibly misidentified. This suspicion was confirmed by checking the salient phenotypic characters of the strains. Strain TMC 1523 is not a strain of M. phlei but of M. smegmatis and that strain SN40, previously identified as a member of M. smegmatis, is a strain of M. fortuitum.

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