[An ecological study on hemolytic streptococci in a baby asylum (author's transl)].
D000328:Adult; D000367:Age Factors; D002353:Carrier State / Q000382:microbiology*; D002648:Child; D002675:Child, Preschool; D003428:Cross Infection / Q000382:microbiology; D006801:Humans; D007223:Infant; D007224:Infant Care; D012621:Seasons; D013290:Streptococcal Infections / Q000382:microbiology*; D013291:Streptococcus / Q000302:isolation & purification*; D014041:Tokyo