Studies on Clinical Isolates of Beta-hemolytic Streptococci

SAWAE Yoshiro, TAKEMORI Koichi, YOKOTA Hideko, TSUTSUI Toshiharu, TANABE Shizue

doi:10.11150/kansenshogakuzasshi1970.57.231

One hundred clinical strains of beta-hemolytic streptococci isolated in Kyushu University Hospital were studied in terms of laboratory and clinical data. They were classified as 30 strains of group A, 47 of group B, 0 of group C, 11 of group G, and 12 of other groups. The Group A strains were mainly isolated from suppurative inflammatory lesions of the upper respiratory tract tissues, and some were also the cause of acute glomerulonephritis and chorea minor. The group B strains were isolated from the urine and other specimens, and some of them were the cause of vaginitis and UTI, and rarely of endocarditis. About half of them, however, were nonpathogenic normal flora bacteria. The group G strains were isolated concomitantly with strains of S. aureus, E. coli, K. pneumoniae, Enterobacter, etc. The other groups were mostly isolated from gingival abscesses and the oral cavity. T-12 and T-6 were the most frequent strains of group A. The API STREP 20 system was the most useful method for the identification of these beta-hemolytic streptococci. The test for susceptibility to Bacitracin was also useful for the identification of group A, but there was the passibility that group G and other strains were mixed in. Pigment-production of Colombia agar was useful for the identification of group B. Clinical isolates of beta-hemolytic streptococci were sensitive to PCs and CEPs, but more resistant to AGs. About 50% of groups A and B were resistant to TC, and 40% of group A were resistant to EM and CLDM.

Studies on Clinical Isolates of <I>Beta-hemolytic Streptococci</I>

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