The Streptococci of Group D; the Serological Grouping of Streptococcus bovis and Observations on Serologically Refractory Group D Strains

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Abstract
The concn. of the group-specific substances in HC1 extracts by precipitation with ethanol has facilitated the serological identification of S. bovis and certain other serologically refractory streptococci as members of group D. The difficulty of preparing potent group sera for S. bovis was overcome by immunizing rabbits with organisms shaken with an abrasive in a magnetic vibrating machine. The relationship of S. bovis to certain other streptococci and the chemical nature of the specific substance of group D are discussed.

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