Using sera from 120 Ecuador people in 1982, a seroepidemiological study was carried out by detecting antibodies against type specific T antigens of type 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 22, 23, 25, 27, 28, 44, 49, B3264 and Imp. 19 of
S. pyogenes, respectively.
1) Positive rate possessing T antibodies of one or more types in Ecuador people aged three months to 78 years was 74.2% and significantly higher than the rate in Akita people in northern Japan where had high incidence of streptococcal infectious diseases. Among the positive rates by age group, those in 7 to 9 and 13 to 15 year old age groups and adults over 20 years, respectively, were as high as 93.3%.
2) 33.3% of antibody positive rate to type 28 antigen was higher than those to antigens of other 20 serotypes, and then the rates of T antibody positive against type 4, 12, 3, 2, 25, 49 and B3264 antigens, respectively, followed. The rates of T antibody positive against type 2, 3, 8, 22, 25, 28 and Imp. 19 in Ecuador, respectively, were also significantly higher than those in Akita.
3) Thus, it was suggested that the incidence of streptococcal infections in Ecuador might exceed that in Akita.
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