1979-fiscal-year-survey for throat-carriers of hemolytic streptococci among children in Tokyo (author's transl)

Abstract

The surveys for throat-carriers of hemolytic streptococci among children of elementary schools and kindergartens in Tokyo were undertaken in November, 1979 and in February, 1980.1) Included in the surveys were 552 children of 7 elementary schools and 2 kindergartens in 7 wards and 1 city of Tokyo. In autumn and winter surveys, 546 and 527 children were examined (521 being inspected at both times), and 256 strains of hemolytic streptococci were isolated from 135 (24.7%) and 121 (23.0%) children, respectively.2) The streptococci wereserogrouped to be 233 group A (91.0%) 15 group G, 6 group B, and 2 group C strains. Serotypes of the group A strains were, in the order of frequencies, T-types 1 (19.7%), 13 (17.7%), 6 (13.3%), 12 (11.6%) and so on. The rates of types 1 and 13 strains were significantly higher in Adachi-ku ward.3) Among 521 children examined, 53 gave positive cultures at both surveys. Serogroups or serotypes of in the autumn and winter surveys isolates were identical in 27 cases (50.9%).4) Considerable differences in carrier rates (6.1-38.4%) were seen among institutions.5) The carrier rates in the autumn and in the winter surveys of 1979 fiscal yearwere not so much different from the corresponding rates obtained in 1977 and 1978 fiscal years.