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Studies on the Dick Test and Natural Immunity to Scarlet Fever Among the American Indians

From the Department of Bacteriology, University of Kansas, Lawrence

Abstract

1. Our experience at Haskell Institute as well as that of physicians at the other Indian Agencies would indicate that where epidemic diseases occur among the whites and exposure is possible, they develop also among the Indians. The one exception reported is scarlet fever.

2. The American Indian apparently enjoys a high degree of natural immunity to scarlet fever.

3. He is apparently exceedingly susceptible to measles, whooping cough, and fairly susceptible to diphtheria and Vincent's angina, as well as to the other infectious and contagious diseases. Very little evidence of furunculosis was obtained although streptococcus infections are quite common.

4. Skin test would indicate that susceptibility to scarlet fever among the Indians is equal to that among the whites in the younger ages, but much less as maturity is reached.

5. This work suggests some other mechanism supplementing antitoxic and perhaps also opsonic immunity to scarlet fever.

6. The results indicate a certain lack of parallelism between the Dick test and natural immunity to scarlet fever.