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Extracellular products of group A streptococci isolated from patients with streptococcal toxic shock syndrome (STSS) examined. The outline of discussion of the 4 products are as follows; Products were streptolysin O (SLO), proteinase, erythrogenic toxin and DNase. SLO showed a large amount of products more than proteinase, erythrogenic toxin and DNase. It should not be concluded that there is a large amount of SLO in the isolated strains from patients with STSS. SLO produced by group A streptococci isolated from the patient with STSS has an isoelectric point (pI) of 6.0 and a molecular weight of 64,000 and shows a hemolytic activity in the presence of 2 mercaptoethanol (2-ME). Furthermore, the hemolytic activities of all components were inhibited by gamma-globulin and cholesterol. These results indicated that all component with hemolytic activity are SLO. These data suggest that STSS does not make up a single syndrome but, rather, that the multiple STSS clinical criteria probably reflects a different characteristic of individual S. pyogenes isolates.

Properties of Extracellular Products Produced by Group A Streptococci Isolated from Patient with Streptococcal Toxic Shock Syndrome