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D002353:Carrier State / Q000453:epidemiology* / Q000382:microbiology; D002648:Child; D003430:Cross-Sectional Studies; D006801:Humans; D007564:Japan; D010614:Pharynx / Q000382:microbiology*; D012703:Serotyping; D013290:Streptococcal Infections / Q000453:epidemiology* / Q000382:microbiology; D013297:Streptococcus pyogenes / Q000145:classification / Q000302:isolation & purification; D013997:Time Factors