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In this book an analysis is presented of the causes for the decline in mortality from tuberculosis. The conclusion is reached that the epidemic character of tuberculosis, characteristic in past centuries, has finally given way to an endemic one. The former epidemicity of the disease was the result of social factors, crowding, malnutrition and poor hygiene. At present these factors are of less general importance, and tuberculosis is to be thought of as an endemic infectious disease affecting rich and poor alike. This conclusion in turn leads to the view that from now on the campaign against tuberculosis must be on a specific therapeutic basis; social and hygienic improvement cannot be expected to be as effective in reducing mortality as in the past. The argument presented by the author is in general convincing.
Kommen und Gehen der Tuberkulose. Eine Epidemiologische Studie.. JAMA. 1931;97(11):802. doi:10.1001/jama.1931.02730110052037