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Examples of Serum-therapy
The possibility of such a method was suggested by the familiar observation, made by Pasteur and numerous other workers, that animals of different species differ widely in their susceptibility to various maladies, and that the virus of a given disease may become more and more virulent when passed through the systems of successive individuals of one species, and, contrariwise, less and less virulent when passed through the systems of successive individuals of another species.
The preventive virus, of varying strengths, was made by maceration of these cords at varying stages of desiccation.
What it had accomplished was regarded as but an earnest of what the new method might accomplish presently when applied to the other infectious diseases.
Hence it was not strange that his paper made a sensation in all circles, medical and lay alike.
Just how much of present promise is tentative, just what are the limits of the methods-these are questions for the future to decide.
Then it is known that Dr. Yersin, with the collaboration of his former colleagues of the Pasteur Institute, has developed, and has used with success, an antitoxine from the microbe of the plague which recently ravaged China.