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. 1994 May;32(5):1256–1260. doi: 10.1128/jcm.32.5.1256-1260.1994

Partial characterization of Streptococcus suis type 2 hemolysin.

I Feder 1, M M Chengappa 1, B Fenwick 1, M Rider 1, J Staats 1
PMCID: PMC263662  PMID: 8051253

Abstract

Streptococcus suis type 2 was evaluated for hemolysin production. Supernatants of S. suis type 2 grown in Todd-Hewitt broth were assayed for hemolytic activity by a photometric assay. Twenty-two additional serotypes of S. suis (1,3 to 22, and 1/2) were evaluated for hemolysin production; nine of them (1/2, 1, 4, 5, 14, 15, 17, 19, and 20) were positive. The effects of temperature, atmosphere, centrifugation, sonication, chemicals, bovine serum albumin, fetal calf serum, and enzymes on S. suis type 2 hemolysin activity were studied. Maximum hemolysis occurred after incubation in RPMI 1640 medium at 40 degrees C in 6% CO2 and after growth in Todd-Hewitt broth at 37 degrees C under anaerobic conditions. Hemolytic activity was absent after the addition of fetal calf serum and decreased after the addition of trypsin or amylase. However, treatment of erythrocytes with amylase or trypsin prior to incubation with supernatant also resulted in a decrease in hemolytic activity. The addition of bovine serum albumin caused increased hemolytic activity. Dipyridyl and EDTA had negligible effects on hemolysis. Hemolytic S. suis type 2 culture supernatant injected intraperitoneally failed to cause death in BALB/c mice. Data from our study indicate that S. suis type 2 hemolysin is a secreted or loosely cell bound, thermolabile molecule whose activity is growth condition dependent.

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Selected References

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