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A Serological and Biochemical Study of Hemolytic Streptococci

From the Connaught Laboratories, University of Toronto

Abstract

1. Of 880 strains of streptococci isolated in Canada, 96.8 per cent were placed in one or other of 7 precipitative types. No strains belonging to groups H or K were isolated in this series.

2. The strains which were not hemolytic on the surface of blood agar plates included 14 group A, 50 group B, 7 group C and 20 strains not grouped. Of these, all members of group A, 4 group B and 3 ungrouped produced beta hemolysis in deep plates, the others being non-hemolytic.

3. Soluble hemolysin was produced by all the strains tested belonging to groups A, F and G, was not produced by group E and produced by part of the members of groups B, C and D.

4. Of 522 strains examined, 128 of 187 group B strains and 1 other strain not grouped showed pigmented cells.

5. Of 371 strains isolated from pathological conditions in human beings, 360 (97 per cent) belonged to group A, 6 to group B, 1 to group C, 1 to group F and 3 to group G.

6. Of 520 group A strains tested for agglutinative types, 93 per cent were placed in one or other of Griffith's types.

7. The predominating scarlet fever types were 1, 2, 3, 4 and 11. The predominating types from non-scarlatinal infections were 11, 13, 17-23-26, 12, 2, 1, 3, 4, 6 and 14.

8. Of 189 group B strains, 92 per cent were placed in one or other of the 4 types of Stableforth by means of precipitative tests.