THE RELATION OF THE DICK TEST TO SCARLET FEVER

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Abstract
G. F. and G. H. Dick1recently reported the results obtained by them from the use of a specific streptococcus filtrate in an intradermal test for immunity against scarlet fever. Our purpose in this paper is to present the data accumulated in our series of cases using the same streptococcus filtrate. Through the courtesy of the Dicks, a small quantity of their original W filtrate, diluted 1:1,000, was obtained and used in our experiments. The filtrate, as we understand it, is from a hemolytic streptococcus isolated in pure culture from a case of scarlet fever. Our experiments, with those of the Dicks, give a series of only 301 cases; but the results are so strikingly similar, yet done under such varied circumstances, that one series checks the other very well. In making these tests and in reading them, we observed the technic and standards adopted by the Dicks. The

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