CLASSIFICATION OF THE HEMOLYTTC STREPTOCOCCI BY THE PRECIPITIN REACTION.
A method is described for the preparation from hemolytic streptococci of extracts containing a soluble precipitating substance. By the use of such extracts, it is shown that nearly all members of this family yield a common precipitable substance. So far, therefore, as concerns the precipitin reaction, the hemolytic streptococci form a practically homogeneous group.
Department of Internal Medicine of Washington University School of Medicine, St. Louis.
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Hitchcock