Abstract
5. Retest of a group of children actively immunized with increasing doses of scarlet fever streptococcus toxin. 1. The application of the Dick test to a group of 320 children at the Horace Mann School and at the Riverdale Country School, New York City, has shown a very high percentage of susceptible individuals in this class of children coming from the more well-to-do homes. The test showed that of 320 children varying in age from 5 to 18 years, 266 or 83.0 per cent were susceptible and gave a positive reaction. The Dick test was also given to 80 nurses at St. Vincent's Hospital, and of these 42 or 52.5 per cent showed a positive reaction. The nurses at this hospital had been previously tested with the Schick test and 55 per cent were found susceptible to diphtheria. A group of babies were tested at the Heckscher Foundation with the following interesting results : Of a group of 4570 individuals varying in age from a few weeks to over 20 years we found that 1543 or 34.4 per cent gave a positive Dick reaction. Up to 6 months the percentage of positive reactions was 44.8; from 6 months to 3 years it ranged from 64 to 71 per cent; from 3 to 5 years between 46 to 56 per cent and from 5 to 20 years between 24 to 37 per cent.
Published Version
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