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We investigated the presence of cytolytic activity in the virulent H37Rv and attenuated H37Ra strains of Mycobacterium tuberculosis and in the vaccine strain Mycobacterium bovis BCG. The virulent strain H37Rv expressed &gt; 3-fold more contact-dependent cytolytic activity than the attenuated strain H37Ra, and the vaccine strain M. bovis BCG did not produce cytolytic activity. We also isolated an approximately 3.2-kbp fragment of the M. tuberculosis H37Rv genome that was capable of inducing this contact-dependent hemolytic activity in a nonhemolytic strain of Escherichia coli.

Expression of contact-dependent cytolytic activity by Mycobacterium tuberculosis and isolation of the genomic locus that encodes the activity