1985 Volume 59 Issue 9 Pages 892-904
During 1.5 months from late April through early June in 1983, we have conducted a survey of an isolation of hemolytic streptococci in throats of elementary school pupils (1st-6th grade) in Akita, Saitama, Niigata, Osaka, Shimane and Saga and of junior high school pupils (freshman) in Kochi. Detection rate of group-A, B, C and G hemolytic streptococci was compared as under the same conditions as possible for preparation of culture medium, collection of samples, culture methods and identification.We have innoculated streptococci on our N-O medium at the place where samples were collected from throats and identified them in our laboratory.The detection rate was higher than that previously reported.The detection rate was the highest in group-A, high in group-B and low in group-G in all schools and their classes, but extremely low or zero in some classes in group-C.The detection rate of group-A varied in every class of elementary and junior high school and the difference of the rate between the highest and the lowest group was 2 to 3 fold, and was high in male whereas that of group-B was high in female.The detection rate of the group-B streptococci was low in the lower grade of pupils and increased as their grade increased, the rate being the highest (19.7%) in the freshman of junior high school at puberty.The detection rate was higher in rural area (Akita, Shimane and Saga) than in urban area (Niigata, Saitama and Osaka).
