Contagious disease

Definition and stakes

Various,  The Harvard Classics Volume 38

“ But it is obvious that, in the majority of cases, it must be impossible to decide by which of these channels the disease is conveyed, from the nature of the intercourse between the physician and the patient.
3. It is not pretended that the contagion of puerperal fever must always be followed by the disease. It is true of all contagious diseases that they frequently spare those who appear to be fully submitted to their influence. Even the vaccine virus, fresh from the subject, fails every day to produce its legitimate effect, though every precaution is taken to insure its action.
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Source: Gutenberg

W. T. Councilman,  Disease and Its Causes

“ He was the first to recognize the specificity of the epidemic diseases, and argued from this that each disease must have a specific cause. "Just as a certain plant comes from the seed of the same plant and not from any plant at will, so each contagious disease must be propagated from a similar disease and cannot be the result of any other disease." Further he says, "It is necessary to assume that during the prevalence of an epidemic the contagious material undergoes an enormous increase, and this is compatible only with the assumption that it is a living substance." ”
Source: Gutenberg

Various,  Popular Science Monthly (1882)

“ How far any such disease may have been prevented from invading new countries, or from spreading from any particular center, by measures directed against contagion. Above all, to determine what is the nature, and what the true value, of the evidence supposed to show that the specific poison of a contagious disease may originate spontaneously, or be generated de novo. "What we most want to know," adds Budd, "in regard to this whole group of diseases is, where and how the specific poisons which cause them breed and multiply." ”
Source: Wikisource

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