Differentiation of Hemolytic Streptococci From Milk And From Human Lesions
Differentiation of Hemolytic Streptococci From Milk And From Human Lesions
Raymond C Salter
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The most constant difference between the two groups is the failure of the latter to ferment saccharose. 5. The identification of hemolytic streptococci should always be confirmed by testing for hen:olysin in broth cultures. The true Beta type produces hen. Olyein in 5&- broth, while others which resertble the Beta type quite closely do not. 6. There la no oonetant dlfferenoe in the hemolytic titer of milk and pathogenic strains, but the time required for hemolysie to take place is distinctly gr...eater with the milk strains. This characteristic could be used to aid in differentiation. 7. The milk hemolytic streptococci are not patho- genic for ttice, and virulence cannot be deir. Onst rated even by euccessive passages. 8. The difference in the thermal death rates of uiilk and pathogenic heitolytic streptococci serves to differ- entiate theic. The former die at a slow rate in milk at 60° C, while the latter die rapidly. 9. With a very large number present it is possible for pathogenic streptococci to survive pasteurization at 60° C.
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