Answers are grounded in this paper and cite their sources.
Representative strains of streptococcus group H and Streptococcus sanguis and of 40 strains from samples of air and from cases of subacute bacterial endocarditis identified as group H were tested with unabsorbed and selected absorbed antisera produced against streptococcus group H No. 36251 and Streptococcus sanguis types I and II. The results of the tests indicated that the strains belonged in at least 5 antigenically different types.
No takes yet. Share an insight, caveat, or question.
Roger Y. Dodd (1949) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: