著者

宮本 泰 児玉 威 秋山 昭一 滝沢 金次郎 松島 章喜

出版者

一般社団法人 日本感染症学会

雑誌

感染症学雑誌 (ISSN:03875911)

巻号頁・発行日

vol.44, no.1, pp.9-11, 1970-04-20 (Released:2011-09-07)

参考文献数

3

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A type distribution survey of A Group Streptococci was conducted cooperatively with twelve institutions including hospitals and public health laboratories in Japan. Six hundred eighty strains of Streptococcus pyogenes were collected, of which 506 were mainly from scarlet fever patients and 174 were from healthy carriers. The alteration of the patterns of main predominant types for the past six years was also depicted.While type 4 strain has gradually been decreasing for the past six years, type 6 strain had once increased to such an extent that the replacement of the former with the latter was about to happen. Being suppressed, however, by the rapid uprise of type 12 strain, type 6 strain has come to decrease again since 1967, thus permitting type 1- and type 2 str ins come to the front to cover the room corresponding to the depression of type 4- and type 6 strains.In April 1968 to March 1969 type 12 representing the absolute predominance (36.9%) for the period was attended by four other principal types 4, 6, 22 and 1. These types were with a slight difference in percentage, almost evenly distributed and seemed to compete with each other, thus exhibiting a trend of multipolarity.The isolation of B3264 and 5/27/44 seemed to be a characteristic of the group of our healthy cartiers. Despite the predominance of type 12 strain we seldom encountered nephritis cases or related syndromes.