Subgroup“V” 抗酸菌の分類学的研究

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Twenty-two strains of Subgroup “V” of the Group III nonphotochromogens, received from Dr. G. P. Kubica, Gerogia, U. S. A. were tested on 97 characters. Frequency of positive characters in the strains and “Hypotheti c a l Mean Organism” (HM0)prepared from the results of the tests are shown in Table 1. In comparison of this HMO of the V-subgroup with the H MO of various other mycobacterial species, the HMO of the V-subgroup showed the highest S-value (92%) with the HMO of M. nonchromogenicum. When a permissible low limit of the mean intraspecies S-value for the membership of each species to its own HMO was calculated as a range of S-values more than the value {(mean intraspecies S-value) × (standard deviation)} (this range contains theore tically 95% of the membership), the S-value for the HMO of the V-subgroup to the HMO of M. nonchromogenicum, 92%, was inside the permissible low limit for the species M. nonehromogenieum, 91%. On the other hand, the S-values for the V-subgroup to the other HMOs were outside the permissible low limit of the other species (Table 2). Thus, the V-subgroup was identified as M. nonchromogenicum. Although some m i nor differences were observed between M. nonchromogenicum and the V subgroup, these two organisms showed similar features in the majority of the characters tested, including resistance to ethambutol and tolerance to sodium nitrite that were newly add ed to the 97 characters previously studied (Table 3), In view of the above results, the V-subg r oup is considered to be a variety of M. nonchromogenicum. The method shown in this study makes possible an automatic identification (“numerical identification”). Application of this method using HMOs is recommended as a meth od of id ent i fication.
日本結核病学会の論文

Subgroup“V” 抗酸菌の分類学的研究

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