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A Theory to Explain the Geographic Variations in the Prevalence of Histoplasmin Sensitivity^1,2,

A soil theory is offered to explain the geographic variations in histoplasmin sensitivity in the United States and the world. It is suggested that the red-yellow podzolic soils, because of their peculiar characteristics, provide the best natural habitat for the growth of H. capsulatum. The theory is tested by comparing the prevalence of histoplasmin sensitivity in areas with red-yellow podzolic soils and in areas with other soils. The percentage of histoplasmin reactors is significantly higher in locales with red-yellow podzolic soils.

¹ Part of a paper "Recent Developments in the Epidemiology of Histoplasmosis" presented to Section on Public Health, Southern Medical Association, Forty-sixth Annual Meeting, Miami, Florida, November 11, 1952, and additional data.

² This investigation was supported in part by a research grant (E-521) from the National Microbiological Institute of the National Institutes of Health, Public Health Service, Department of Health, Education and Welfare; and in part by a grant from the Division of Medicine and Public Health, Rockefeller Foundation.