STUDIES ON THE BIOLOGY OF STREPTOCOCCUS : I. ANTIGENIC RELATIONSHIPS BETWEEN STRAINS OF STREPTOCOCCUS HAEMOLYTICUS.
1. Immunological differences have been shown to exist between strains of Streptococcus hoemolyticus 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.
Hospital of The Rockefeller Institute for Medical Research.
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Dochez
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Avery
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Lancefield