Epidemiological study of hemolytic streptococci in pupils in seven prefectures in Japan.
D002648:Child; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D012424:Rural Population; D013290:Streptococcal Infections / Q000453:epidemiology*; D013292:Streptococcus agalactiae / Q000302:isolation & purification*; D013297:Streptococcus pyogenes / Q000302:isolation & purification*; D014505:Urban Population