ひな白痢菌ファージに関する研究 : III. I型菌の分類と疫学に関する検討

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  • STUDIES ON SALMONELLA PULLORUM PHAGE : III. CLASSIFICATION OF STRAINS OF INTERMEDIATE TYPE OF SALMONELLA PULLORUM AND EPIZOOTIOLOGICAL STUDY ON PULLORUM DISEASE
  • ヒナハクリキン ファージ ニ カンスル ケンキュウ 3 1ガタキン ノ ブンルイ ト エキガク ニ カンスル ケントウ エイブン

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The intermediate (I) strains of Salmonella pullorum, which had been detected most frequently in Japan, were classified on the basis of the kind of liberated phages and susceptibility to group IV phages. Moreover, epizootiological investigation was carried out on pullorum disease. The results obtained were summarized as follows. 1. Eighty-eight strains of I type were divided into 9 types, from "a" to "i", on the basis of the kind of liberated phages and phage susceptibility. 2. The strains isolated from adult chickens and those from chicks were classified into 3 and 8 types, respectively, by using the same method as above. 3. In general, a single type was detected from all the adult chickens of the same flock. Two types were detected, however, from each of 4 flocks out of thirteen. 4. In 20 of 21 cases of adult chickens, chicks, and dead-in-shell chicks, the strains isolated from an individual were of the same type. In the remaining case, two types were detected from a chicken. In this bird, the type isolated from unabsorbed yolk was different from that isolated from the other organs. The author wishes to express his cordial gratitude to Professor K. ITAGAKI, head of the department to which he belongs, for the direction and review of this manuscript. He is indebted to Professor K. HIRATO of Hokkaido University and Assistant Professor K. ISHII of this department for valuable advice and encouragement. He would like to express his thanks to Professor S. MIURA of Hokkaido University for his helpful advice and supply of the strains of S. pullorum, and Professor S. HAMADA of Hokkaido University for his helpful advice.

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