1. Immunological differences have been shown to exist between strains of Streptococcus hœmolyticus of the human type.
2. Four biological types have been identified by means of the reactions of agglutination and protection.
3. At least two other types have been encountered and the indications are that more exist.
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Copyright, 1919, by The Rockefeller Institute for Medical Research New York
1919
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