北海道に於ける有反應無病巣牛に關する細菌學的研究 : I. 人型結核菌の分離に就て
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In Hokkaido, the number of tuberculin-reacting cattle is now decreasing year after year. Recently, however, it is generally accepted that there are many no-lesion reactors in Hokkaido. Now the rapid clarification of what agents are associated with this phenomenon is very eagerly desired. So the authors' purpose was to carry out bacteriological investigations on this problem and to collect as many materials as possible from various parts of Hokkaido. Morbid changes were inspected and afterward animal inoculations were made as well as cultural examinations with those materials. Results obtained are summarized as follows : 1) In 1951,63,751 cattle were tested in all districts of Hokkaido; 30 cattle reacted. We macroscopically examined 21 cases of them, however, no tuberculous lesions could be detected. Histological investigations showed also negative results. From these facts, it is obvious that all of these cattle were so-called no-lesion reactors (Table 1). 2) Myco bacterium tuberculosis was found in 4 out of 21 reacting cattle. The direct cultural examinations of the materials revealed the bacilli from bronchial (No. 1), mesenteric (No. 2) and retropharyngeal lymph nodes (No. 15). In the case of No. 9,the bacilli were isolated from two guinea pigs inoculated-one with the mixed materials of bronchial, mesenteric lymphnnodes and lung and the other with submaxillary, retropharyngeal and axillary lymph nodes (Table. 2). It was especially noted that 3 out of these 4 strains were identical with the human type. Another was an atypical acid-fast organism. From the several biological characteristics and pathogenicity to the laboratory animals, we believe that this organism should be ranked an intermediate form between the virulent tubercle bacilli and non-pathogenic acid-fast organisms. It was also noteworthy that in no instances could we detect the bovine type of tubercle bacilli (Table 3,4,5). 3) In addition, enquiries were made about sick persons at the farms where reacting cattle had been revealed. It was found in 8 farms, that tuberculous patients have been in contact with the animals (Table 1) 4) From the above described results, it is evident that the human type of tubercle bacilli plays an important role in the occurrence of no-lesion reactors in Hokkaido.
- 北海道大学の論文
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