Abstract
The pathogenicity for mice of 12 strains of Mycobacterium abscessus was compared with that for 8 strains of M. fortuitum. Both species caused lesions in kidneys and produced “spinning disease” resulting from inner ear infections. No major differences in pathogenicity of these two species were demonstrated. Strain to strain variation was marked, especially with M. abscessus. For example, 1.6 × 106 organisms of strain 11188 of M. abscessus produced death in four of five animals within 42 days, whereas strain 380 of M. abscessus failed to produce any deaths within 42 days. In the case of M. fortuitum, the greatest mortality observed was one of five animals, yet the incidence of spinning disease and kidney disease occurred earlier postinfection than in mice infected with M. abscessus. Histologically, abscess formation by a strain of M. abscessus was greater than by a strain of M. fortuitum, but this difference cannot be interpreted as a species difference.
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