[Annual changes in type distribution of group A streptococci in Sapporo during the 11-year period between 1975 and 1985].
D000367:Age Factors; D002648:Child; D006801:Humans; D007564:Japan; D012541:Scarlet Fever / Q000382:microbiology*; D013297:Streptococcus pyogenes / Q000145:classification / Q000302:isolation & purification*; D013997:Time Factors