STUDIES ON BACTERIOPHAGE TYPING OF STAPHYLOCOCCI ISOLATED FROM BOVINE MILK : I. TYPING BY MEANS OF 20 PHAGES OF THE INTERNATIONAL SERIES

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概要

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• An investigation was carried out on the bacteriophage typing of 375 strains of coagulase positive staphylococci isolated from bovine milk in this country by the use of the phages of the International Series; further, a comparison was made with the series of findings previously reported on staphylococci of human origin by many workers. Furthermore, it was discussed whether these phages could be applied to the classification of the cultures which were originated from bovine milk. The results are summarized as follows : 1. Out of the 375 strains above mentioned, 171 (45.6%) were typed by one or more of the twenty phages used; these typable strains belonged predominantly to type III (62 strains) and to type IV (57 strains). The relative frequency with which the staphylococci were lysed by the different phages showed that the greater portion of strains were sensitive to phages 42E, 6,47,75 or 42D. 2. It was concluded that there existed some dissimilarities between the strains of human origin and the milk strains in their phage susceptibilities. This conclusion is based on the following facts : a considerable number of strains isolated from bovine milk were those of type IV which were rarely encountered in the cultures of human origin, whereas types I and II were rare in number. Furthermore, the type III strains from bovine milk were often sensitive to the phage of group IV, though their reactions were weak. 3. The phages of the International Series are proven to be unsuitable for the typing of staphylococci from bovine milk in Japan. The important reasons for this were as follows : (a) more than half of the milk strains submitted to typing were untypable, and, in addition, the results obtained were often inconstant, (b) although a considerable number of the milk strains were classified into type IV, no more than one phage belongs to group IV in the phages of the International Series, (c) the main four phage groups distinguished in this phage set were not suitable for the classification of the milk strains of staphylococci, and the strains regarded as a border-line type between two types were frequently observed. The author wishes to express his cordial thanks to Prof. K. HIRATO, the chief of this Department, for his helpful advice and review of this paper. The author is indebted to Prof. Y. OCHI of Tokyo University and Prof. Y. TAJIMA, Institute for Infectious Disease, Tokyo University, for their kind supply of the strains of staphylococci.

• 北海道大学の論文

著者

• Nakagawa M.

  Department of Obstetrics and Gynecology, Hyogo Medical College

• Nakagawa Masaro

  Department Of Epizootiology Faculty Of Veterinary Medicine Hokkaido University:(present Address) Nat

• Nakagawa Masaro

  Department Of Veterinary Hygiene And Microbiology Faculty Of Veterinary Medicine Hokkaido University

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