In Vitro Properties of Mycobacterium lepraemurium Strain Keishicho

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Abstract
The morphologic, biochemical, and drug susceptibility characteristics of the Keishicho strain, supposedly a strain of Mycobacterium lepraemurium, are compared with these same characteristics of representative strains of other slow-growing mycobacterial species. The Keishicho strain is quite distinct from all other mycobacteria. Special media and very large inocula are needed for in vitro growth; growth is exceedingly slow. The inter-taxon similarity coefficients were low; the highest, only 63%, was to Mycobacterium tuberculosis.