SUMMARY: The reactions of 1498 isolates of slowly growing mycobacteria in 50 character states have been compared to those of 17 hypothetical median strain patterns. The establishment of intra- and intertaxon matching values for clusters so generated, allowed certain aggregates of taxa to be recognized for which a conventional × matching matrix might provide more clear cut taxonomic definition of species. Those species which are clearly distinct from the others include and Problems still exist regarding the precise separation of taxa within Runyon Groups II (M. and IIIB) and Group III ( and ). These latter are discussed.


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