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3) Swift, H. F. and Derick, C. L.: Reactions of rabbits to nonhemolytic streptococci. II. Skin reactions in in-travenously immunized animals. J. Exp. Med., 49, 883-897, 1929.
4) Derick, C. L., Hitchcock, C. H., and Swift, H. F.: Reactions to nonhemolytic streptococci. III. A study of modes of sensitization. J. Exp. Med., 52, 1-22, 1930.
5) Beachey, E. H., Alberti, H., and Stollerman, G. H.: Delayed hypersensitivity to purified streptococcal M protein in guinea pigs and in man. J. Irnrnunol., 102, 42-52, 1969.
