Abstract
This paper, as its title indicates, is an account of experiences of the Department of Public Health of Philadelphia with active immunization against scarlet fever. It is not in any sense a bacteriologic or biologic discussion of the specific nature of the streptococcus of scarlet fever or of the biology of the toxin. It is, however, a record of a sufficient number of cases to give weight to the conclusions that in this method of immunizing, as laid down by the Dicks, there is a sure means for the prevention of the disease and its after-effects. It seems strange that reiteration of experience already so great and of figures should be necessary to convince the medical men at large of the efficacy of the proceeding, particularly in the light of their attitude toward diphtheria prevention in its struggle for general adoption. Almost ten years of accumulated facts was needed before

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