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[Studies on thiacetazone resistance of tubercle bacilli. II. The relation between virulence in guinea-pigs and thiacetazone sensitivity of tubercle bacilli isolated from previously untreated tuberculous children].

Many workers reported that the virulence in the guinea-pigs of tubercle bacilli from previously untreated tuberculous patients differs markedly in various countries. Some workers showed that South Indian strains demonstrated the low virulence in the guinea-pigs and the low virulence was related to thiacetazone resistance. The other reports showed the high virulence in the guinea-pigs and the low resistance for thiacetazone of East African strains. The high virulence and the high thiacetazone resistance of Hong Kong strains were also reported. In part I, the authors reported the thiacetazone sensitivity of 40 strains isolated from previously untreated tuberculous children in Japan. This paper presents the virulence in the guinea-pigs and the thiacetazone sensitivity of 30 strains out of 40 strains used for the experiment in part I. Six guinea-pigs were inoculated 0. 1 mg each subcutaneously and autopsied at six weeks after the infection. The method for the preparation of bacillary suspension was described in part I. The virulence in the guinea-pigs of the test strains was interpreted by Macroscopic Index, Root Spleen Index and the number of viable bacilli in the spleen. The maximum macroscopic index of tuberculous lesion was 4-in the lymph nodes and 5— in the viscera (lung,