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Hemolytic activity of isolates of Yersinia sp.

One hundred and thirty one strains of Yersinia sp. isolated in Italy from 1979 to 1982 were examined for their ability to produce hemolysis on blood agar. Hemolytic activity was shown by seventy four strains on chicken blood agar and rabbit blood agar with 0.5% lecithin at 28 degrees C. No hemolytic activity was shown at 37 degrees C.