[Isolation trends on group A streptococci isolated from clinical specimens in hospitals in Saitama, 1979-1989].
On 4,864 group A streptococci isolated from throat culture of patients in hospitals in Saitama from 1979 to 1989, we have done an epidemiological analysis of the T-type detection rates and the T-type epidemic, the monthly isolation rates, and the isolation rates by sex and age of patients. 1. The T-type detection rates of 4,864 isolates of group A streptococci showed type T12 in 22.6%, type T4 in 16.4%, type T1 in 10.8%, type T13 in 8.5%, type T6 in 7.6%, type T28 in 6.9%, type T3 in 6.1% and type T18 in 5.3% etc, and the largest number of isolates was type T12 among 16 T-types. 2. The main epidemic T-type during the investigation was type T12, and it was at the top from 1980 to 1981 and from 1984 to 1985. The others, type T4 was at the top from 1982 to 1983 and from 1983 to 1989, type T3 was in 1986, type T6 was in 1987, and type T1 was in 1988, especially it has been suggested that there are the high epidemic T-types and low epidemic T-types among the T-types of throat group A streptococci. 3. Monthly epidemic pattern of throat group A streptococci in each year showed two small epidemic peaks on March and June, a large epidemic peak from November to December since a turn on August. Further, the monthly epidemic pattern has been repeated every year. 4. Throat group A streptococci isolated from patients occupied 87 per cent by the patients from 0 to 14 years, the peak of age distribution showed by age group from 5 to 7 years. The sexual ratio of male to female was in the ratio 1:0.9. Further, the throat group A streptococci isolated from patients of age greater than 15 years was occupied about 50 per cent by age group from 30 to 39 years. A sexual ratio of male to female in the age group was in the ratio 1:1.8.
Okuyama
Y
Y
Saitama Institute of Public Health.
Inoue
Y
Y
Ishihara
H
H
Oshima
M
M
D000328:Adult; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010614:Pharynx / Q000382:microbiology*; D012621:Seasons; D012703:Serotyping; D013290:Streptococcal Infections / Q000453:epidemiology / Q000382:microbiology; D013297:Streptococcus pyogenes / Q000145:classification / Q000302:isolation & purification*