Excerpt from The St. Louis Medical and Surgical Journal, Vol. 75: July-December, 1898
Therefore no one can trace the origin of any germ disease any more than he can trace back through the centuries the origin of any particular variation of the original bacillus.
Here are a few examples of change produced by certain condi tions of life. The Aymaras and Tucas of Peru, living in close association in their journeys, copulating with the female llama, contracted a disease, supposed to be syphilis, transmitted ever afterwards in America from man to man.
Chinamen, living in close proximity to rats, and feeding on them, contract bubonic plague, a disease peculiar to the rat family. This also is eventually transmitted from man to man.
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