The rapidly accumulating experience with the Dick test for susceptibility to scarlet fever is disclosing some of its close analogies to the Schick test for diphtheria. Zingher 1 of the New York City Department of Health, who has had unusually extensive opportunities for investigating the new reaction, finds the highest incidence of positive responses in persons below the age of 3 years. Among nearly 5,000 individuals tested with the Dick scarlatinal toxin, 34 per cent. gave a positive reaction; yet among those over 20 years of age there were only 18 per cent. that exhibited such susceptibility. The discussion of the subject at the recent meeting of the American Medical Association in Chicago 2 developed the fact that there exists a placental immunity. The new-born infant is susceptible when the mother is susceptible, and in older children there is increased susceptibility in the ages from birth on. A further similarity
SCARLET FEVER AND THE DICK TEST. JAMA. 1924;83(6):445. doi:10.1001/jama.1924.02660060049016
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