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SUMMARY: Twenty-nine strains of streptococci from patients with subacute bacterial endocarditis, three type cultures of Streptococcus sanguis, and eighty strains of streptococci from the blood of persons after dental extraction were tested physiologically and serologically.
Six endocarditis strains fall into Lancefield group H and four into Lancefield group D; the remaining nineteen were serologically heterogenous. Thirteen of the endocarditis strains produced a serologically reactive dextran in sucrose broth. Of these five were group H streptococci; the rest represented several serological types.
Of the three dextran-producing strains of Str. sanguis examined, types I and I/II were placed in Lancefield group H, whereas type II was serologically distinct.
The eighty strains from dental bacteraemias included ten which produced a dextran; five of these were group H streptococci.
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