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In our discussions of infectious diseases in their various aspects, we generally assume the attitude of an observer at close range whose field of vision fails to include many features of general interest. The biologic problems, for instance, presented by pathogenic bacteria in their adaptation to parasitic existence are quite likely to escape the attention of the physician who is more directly concerned with the immediate outcome of actual infections; yet problems of this kind offer many attractive subjects for thought to those who wish to go below the surface of the things with which they are dealing. In his address before the Congress of Arts and Science in St. Louis last fall, Theobald Smith discussed certain phases of microbic parasitology from the broad biologic or comparative point of view in a way that can not but interest many physicians and place more or less familiar phenomena in a new
DECLINING VIRULENCE AND ADVANCING PARASITISM.. JAMA. 1905;XLV(6):404–405. doi:10.1001/jama.1905.02510060040007
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